Why XWiki attachment virus scanning belongs in the rollout plan
Any XWiki instance where many people upload files into pages carries a simple risk: one infected attachment can be opened by every colleague who views that page. XWiki attachment virus scanning with ClamAV addresses this by passing uploaded files to a ClamAV daemon through XWiki's Antivirus Application, which can block infected uploads and run scheduled scans over the attachments already stored. DeployOpen plans and builds this in your own infrastructure, so the scanner, its updates and the scan reports stay under your control.
Treat scanning as a rollout requirement, not an afterthought. Once users start uploading to wiki pages, the attachment store grows quickly, and files added before scanning was enabled will not be checked by an upload gate. Decide early whether existing attachments need a one-time full scan, who receives scan reports, and which team acts on a detection. These decisions affect the ClamAV sizing, the notification setup and the operating procedure, so they belong in the plan before the production cut-over. Confirm the exact Antivirus Application version and its configuration options against the XWiki version you run. Extension compatibility is tied to the XWiki release line, and the stable, LTS and intermediate LTS lines may not ship the same extension versions. Check the extension's compatibility notes and its configuration keys for your release before you write the build plan, and do not assume settings carry over from a version you tested elsewhere. Ask the people who own your wiki which upload paths exist. Attachments can arrive through the standard page editor, through imports, through extensions that store files, and through the REST interface. Each path needs to be tested against the scanner, because a path that bypasses the upload check leaves the rest of the control set without effect. Record the results so an auditor or security reviewer can see which paths were covered and how. Plan for the cases where the scanner cannot answer. If ClamAV is unavailable or its signature database is out of date, you need a defined behavior, such as rejecting uploads until the scanner returns, and a monitored alert that tells the platform team when that happens. Agree on who is paged, how quickly a detection is reviewed and how a quarantined file is handled and removed. Writing these steps down now prevents an ad hoc decision during an incident.
Which scanning configurations fit which attachment stores
This table compares the main scanning choices for XWiki attachments: when files are scanned, where ClamAV runs and who receives reports. Read each row for when the option fits and what it costs in exposure, scanning load or operating effort. Confirm the XWiki line first, because the Antivirus Application release you can install depends on whether you run stable, LTS or intermediate LTS.
| Configuration choice | When it fits | Trade-off to accept |
|---|---|---|
| XWiki line (stable, LTS or intermediate LTS) | Decide this first, then confirm which Antivirus Application release that line supports | Release availability differs by line, so a design built on one line may need rework on another |
| Upload-time blocking | Stores where users upload files from outside and no file should be readable before it is scanned | Each upload waits for the scan, and you must decide whether uploads fail or pass if ClamAV is unavailable |
| Scheduled full scans | Large existing stores with files added before scanning existed or through import paths | Infected files stay reachable until the next scan, and full scans add disk and CPU load on the store |
| Blocking and scheduled scans together | Regulated stores that need both prevention at upload and a sweep of the whole attachment base | More settings to configure, verify and monitor, and two sets of results to reconcile |
| Dedicated ClamAV host | High upload volume, large stores or a need to keep scanning load away from the wiki tier | An extra server to patch, monitor, back up and size separately from the wiki |
| Shared ClamAV host | Small installations or an existing scanning service that other systems already use | Scan queues compete with other consumers, and signature or version changes affect every client |
| Reports to wiki administrators | Small teams where one group runs both XWiki and its attachment policy | Reports may reach people without security authority, and a single mailbox can become a bottleneck |
| Reports to a security operations queue | Organizations with a SOC or ticketing system that owns malware events | Needs routing rules, named owners and an agreed response for quarantined or removed files |
| Reports to both administrators and security | Teams where wiki owners restore content and security owners assess the threat | Duplicate alerts are likely, so agree in advance who acts on each event type |
How ClamAV scans XWiki attachments on upload and on schedule
Two scanning paths matter for XWiki attachments, and they catch different things. The first checks a file when someone uploads it. The second re-checks the attachments already stored in the wiki. In the setup this page describes, the XWiki Antivirus Application hands an attachment to a ClamAV daemon, the daemon returns a verdict, and XWiki decides whether to keep the file or block it. The daemon does the signature matching. XWiki does the enforcement. Plan both halves before you rely on either, because a scanner that runs but whose verdicts are not acted on protects nothing.
On upload, the check runs before the file is accepted into the page, so a file that matches a known signature can be refused at the point of entry. This catches known malware from the moment it arrives, and it is the control most users will experience directly. It misses anything the signature database does not yet recognize, and it does not revisit files that were accepted before the scanner was configured or before its signatures were updated. Ask your team to confirm how the installed version handles an upload when the daemon is unreachable: whether the attachment is refused, accepted without a scan, or held for review. That behavior decides your exposure during an outage.
A full scan works through the existing attachment store on a schedule. It finds files that were stored before the scanner existed, files accepted while signatures were out of date, and files whose risk changed after a new signature shipped. Its limits are timing and reach. A file can be malicious for the whole period between upload and the next scheduled run, and a full scan only reports what the store contains at that moment. Confirm in the installed version's documentation which scan job, schedule and report options exist, and whether a finding quarantines the file automatically or only notifies an administrator.
The exact integration points and configuration keys differ between XWiki versions and between the Antivirus Application and ClamAV releases. Do not assume the names, endpoints or defaults in this section. Read the documentation for the versions you have installed, confirm the connection settings and the action taken on a positive verdict in a test instance, and record the results. Decide before go-live who receives scan reports, who can release a quarantined file, and what happens when a finding involves a page that other teams depend on.
Setting up ClamAV scanning for XWiki attachments step by step
This sequence takes an XWiki site from a confirmed deployment to a tested setup in which uploads are scanned by ClamAV, infected files are blocked, and administrators receive scan reports. Each step ends with a check you can record before moving on. Run the early steps in a test wiki on a copy of your data, and keep production wikis unchanged until the reports arrive.
Confirm your XWiki deployment and image variant
Start by recording which XWiki line you run: stable, long term support (LTS) or the intermediate LTS line. Note the image tag, the database variant (MySQL, PostgreSQL or MariaDB) and the architecture, amd64 or arm64v8. The official images run on Tomcat and are maintained by the XWiki Core Dev Team, so check your tag against the official image documentation before changing anything. Done when a test wiki on the same tag loads, an administrator can log in, and you have written down the versions the scanner setup must match.
Deploy or identify a ClamAV daemon
Decide whether an existing clamd service can serve XWiki or whether you need a new daemon on a host or container network you control. XWiki calls the scanner over the network, so it must run as a service the application can reach, and a command-line check alone does not prove that. Confirm with your security team how signature updates are fetched and how often the database refreshes in your environment. Done when the daemon reports a healthy status from a shell on its own host, and you have recorded its address and listening port.
Check network path and file permissions
Open only the path from XWiki to the daemon, and only the port the daemon listens on. Test the connection from inside the XWiki runtime, such as the Tomcat container or pod, because a shell on another host can succeed where the application fails. Confirm that name resolution works inside that runtime and that the daemon is bound to an address XWiki can reach. If the scanner reads files from the attachment store, give its service account read access to the copy path only. Done when a test connection from the XWiki runtime succeeds, a blocked port fails, and both results are recorded in your change log.
Install and configure the Antivirus Application
Install the Antivirus Application from the XWiki Store on the test wiki first, following the extension documentation for the XWiki line you confirmed in the first step. Enter the daemon address, port and connection settings, then set size and timeout limits to match the largest attachment users are allowed to upload. Decide in writing what happens when the daemon cannot be reached, since whether uploads are blocked or accepted in that case is a policy decision for your security owner. Done when any status or connection check the extension provides reports success and a clean sample file passes.
Enable upload blocking in a test wiki
Turn on upload blocking only in the test wiki, where a mistake cannot disrupt users. Upload a clean file and confirm it is stored and can be downloaded. Then upload the EICAR test string, a harmless file that ClamAV's signatures are designed to detect, and confirm the upload is refused and the file does not appear in the attachment list. Repeat the check with the daemon stopped to see how the wiki behaves under the policy you chose. Done when the clean file persists, the test file is blocked, and both results appear in the application log.
Run a scheduled full scan on a copy
Take a consistent copy of the attachment store together with a matching database backup, so the scan sees the same files the wiki references. Point a scheduled full scan at that copy, keeping production storage out of the job. Watch CPU, memory and disk load during the first run, since scan time grows with the size of the store and sizing for large stores is a separate planning task. Check the extension and daemon documentation for recommended schedules and resource profiles for your store size. Done when the scan completes, the job log lists files scanned and any findings, and you know how long the run took on your hardware.
Verify administrators receive scan reports
Set the report recipients to the administrator group or a monitored mailbox, then trigger a finding on the test wiki by uploading the test file again. Confirm that the notification arrives, that the mail path from XWiki works through your relay, and that the report names the wiki page, the attachment and the detection name. Ask an administrator outside the setup team to read it. Done when a named administrator has received and acknowledged a report for the test finding, and you have written down who reviews scan results each day.
Sizing ClamAV for large XWiki attachment stores
Size the ClamAV host from measured scan behavior on your own attachments, not from a guess about how many files you hold. The main inputs are total attachment volume, the file size distribution, how often new files arrive, how often a full scan of the whole store runs, and how long a full scan window can last before administrators or users notice the effect. Each of these changes CPU, memory and disk I/O demand in a different way. Total volume determines how much data a full scan must read. File size distribution matters because a store of many small office documents and a store with a few very large archives or media files can have similar byte totals but very different scan times per file. Upload frequency sets the steady load of on-upload scanning, which the Antivirus Application triggers as users attach files.
The scan schedule is the lever teams most often underestimate. A full scan re-reads attachments that were already checked, so its cost grows with the whole store, while upload scanning grows with new activity. If a full scan runs during business hours, it can compete with upload scanning for CPU, memory and disk reads on the same ClamAV daemon. Users then see slower attachment saves, and uploads may queue or time out depending on how the XWiki side is configured. Decide the longest acceptable scan window first, then work backward to the scan frequency and host size that fit inside it. Confirm the exact daemon settings, concurrency options and timeout behavior for your ClamAV and Antivirus Application versions with their documentation and your own test results.
Measure a representative sample before you choose a host size. Pick attachments that reflect your real mix of file types, sizes and age, including the largest files users are likely to upload. Run a full scan of that sample on hardware that matches the candidate host, and record elapsed time, CPU use, memory use, and any timeouts or failed scans. Repeat the test while the same host also handles simulated upload traffic, because the interaction is where capacity problems appear. Extrapolate to the full store only with clear assumptions, and rerun the test after your attachment volume grows or your scan schedule changes.
Do not size from vendor claims or from another organization's numbers. Our benchmark results and throughput figures are not published here because they depend on your file mix, hardware, storage latency and scan settings. Ask your team to define the acceptable scan window, the expected upload peak, and the maximum time an upload may wait for a verdict. Those three answers, together with measured sample results, give you a host specification you can defend in a review. Plan to repeat the measurement during the first months of operation, and before any change to the store's size, the scan schedule or the ClamAV release.
When you request a quote, ask the implementation partner to state the sample method, the test environment, the assumptions used to extrapolate to the full store, and the recommended scan window. Ask whether the quote includes the benchmark itself, a rerun plan and documentation of the settings used. Hardware and cloud capacity are recurring costs that your team pays for directly, so ask for the sizing logic as a written deliverable that your operations staff can reuse when volume grows.
Security and operational risks in attachment scanning
Attachment scanning changes what happens to a file at upload and after it is stored, so each decision needs an owner and a check. The cards below cover the failure paths that matter most for XWiki and ClamAV: how infected files are handled, what happens when the daemon is unavailable, how signatures stay current, who can read scan results and what evidence the setup leaves behind. Scanning reduces risk, but it does not replace content policies or user training.
Handling of infected attachments
An infected upload can be rejected before it is stored, or stored and flagged, and those two outcomes leave different traces. Confirm with your Antivirus Application configuration whether a flagged attachment is blocked, removed or kept for review, and who decides. Test with a harmless EICAR test file so you can see the exact result on a real page.
Daemon failure behavior
If the ClamAV daemon is down, slow or unreachable, uploads may either pass unscanned or fail outright. Each behavior has a cost: the first lets unscanned files into the wiki, the second blocks legitimate work. Decide the policy in advance, set up monitoring on the daemon, and rehearse a stop and restart during a test window.
Signature database updates
Detection depends on virus signature databases that go stale quickly if nobody refreshes them. Confirm how the ClamAV freshness check runs in your environment, where the signature files are stored, and what alert fires when updates fail. Record the signature version in your operations runbook so you can show when a scan ran against which definitions.
Access to scan reports
Scan reports can name users, page locations and file hashes, which is sensitive even when no malware is found. Limit the reports to the administrators who handle incidents, and check which XWiki rights let other users view the administration pages where reports appear. Review these rights after each XWiki upgrade or permission change.
Audit logging for evidence
An auditor or incident responder needs to see what was scanned, when, by which engine version and what the result was. Confirm which events the Antivirus Application writes to XWiki logs and whether those logs are forwarded to your central log store with retention that matches your policy. Test that a sample detection can be traced from upload to report.
Scope of scanning controls
Scanning only checks files against known malware signatures, so it does not judge whether content is appropriate, confidential or permitted. Pair it with a written content and attachment policy, clear rules for who may upload executable or archive files, and user training on phishing and suspicious links. Document these as separate controls so auditors can see each one.
How administrators receive scan results and reports
Administrators need three distinct kinds of signal from the scanning setup: which attachments were blocked at upload, which scheduled full-scan runs found threats, and when the ClamAV daemon failed or its signature database became stale. Each signal answers a different question. A blocked upload asks whether a user needs help and whether the same file appeared elsewhere. A full-scan finding asks what was already stored and who could have opened it. A daemon or signature fault asks whether protection is currently running at all. Before you configure anything, confirm in the installed Antivirus Application version which of these events are written to logs, which can be emailed, and whether the report format and delivery options match what your team needs.
Decide ownership before the first alert arrives. A reasonable starting split is a security triage owner for blocked uploads and detections, a platform owner for daemon availability and signature freshness, and a wiki administrator for quarantined pages and contact with the uploading user. Write this as a short routing table that lists each event type, the owner, the escalation contact and the response expectation you agree internally. Then check whether the application can send different event types to different recipients, or whether it sends everything to one address. If it cannot, plan a mail rule or chat integration on your side so that a single inbox does not hide the daemon failure among routine detections.
Test delivery before you rely on it. In a staging XWiki instance, upload a harmless test file that the scanner is designed to flag, then confirm that the expected recipient receives the blocked-upload notice. Next, stop the daemon for a short, controlled interval and confirm that the health alert reaches the platform owner. Repeat the check for a full scan and for a stale signature condition if the version supports it. Test each recipient path separately: the individual mailbox, the group alias, and any chat channel. Confirm that spam filters do not hold the messages and that a second person receives them during planned absence. Record the date and the result of each test.
Keep records that support an internal review or an external assessment. Retain scan and alert logs, copies of the notifications sent, the signature version and date in effect at each event, the routing table, the configuration snapshot, and the test evidence from staging. Retention periods come from your own policy and from any legal or regulatory duty that applies to your data, so confirm them with your compliance lead and with the assessor. Note that quarantined attachments may contain personal or confidential data, so limit who can open them and log that access. DeployOpen can prepare the systems, controls and evidence for an assessment, but independent auditors and certification bodies issue any conclusion about them.
What to confirm about the Antivirus Application before rollout
The Antivirus Application and ClamAV behave differently depending on your XWiki line, connection method and attachment profile. The points below are the ones to verify in your own environment before users can upload to production, with a note on where each answer should come from.
Compatibility with your XWiki line
Confirm that the Antivirus Application version you plan to install supports the XWiki line you chose, whether stable, long term support or the intermediate LTS line. Check the extension's compatibility notes in the XWiki Store and the release notes for your exact XWiki version. Test the install on a staging wiki that matches production before you schedule any change.
Supported ClamAV connection methods
Confirm which ways the Antivirus Application can reach ClamAV, such as a network socket or a TCP connection, and which of these your deployment can use. Check the extension documentation and the ClamAV daemon settings on the host or container that will run the scanner. Verify the connection from the XWiki server in a test wiki before you rely on it.
Large files and archives
Confirm how the scanner handles very large attachments and compressed archives, including whether oversized files are rejected, skipped or passed through unscanned. Check the ClamAV size and recursion settings and the Antivirus Application configuration screens in the XWiki administration interface. Upload test files at your largest expected size and at the boundary values you configure.
Encrypted and password-protected files
Confirm what happens when a user uploads an encrypted or password-protected archive, since the scanner cannot inspect content it cannot open. Decide whether such files are blocked, quarantined or allowed with a report to administrators, and confirm that the extension applies that rule. Test each case in a staging wiki and record the result.
Scan timeouts and failure behavior
Confirm the timeout value the Antivirus Application uses for a scan and what it does when a scan times out or ClamAV is unreachable. Check whether uploads fail closed or open, and where that setting lives in the XWiki administration interface or the extension documentation. Simulate a stopped ClamAV service to observe the actual behavior.
Coverage of attachment history and versions
Confirm whether scheduled full scans and upload checks also cover older attachment versions and history, not only the current file. Check the extension documentation and run a scan on a page with several attachment versions in a test wiki. Record which versions are scanned so your retention and cleanup policy matches what is actually covered.
Questions buyers ask about ClamAV scanning for XWiki
What drives the cost of setting up ClamAV scanning for XWiki attachments?
The main cost drivers are the size and age of the existing attachment store, the number of XWiki instances or farms that need scanning, and how much of the surrounding infrastructure has to be built or changed. Scanning a small wiki with a few hundred attachments is a different job from scanning a multi-terabyte store that has years of unscanned files. Components that move the price:
- Sizing and deploying the ClamAV daemon, including memory and CPU for signature updates and concurrent scans.
- Configuring the Antivirus Application, upload blocking rules and scheduled full scans.
- Building the administrator report workflow and testing how infected files are handled.
- Running a first full scan of existing attachments and reviewing the results.
One-time build work is separate from any recurring operation, such as monitoring the daemon and keeping signatures current. Ask any provider to price these as separate line items.
How long does a typical ClamAV setup for XWiki take?
Duration depends mostly on the attachment volume, the hosting model and how quickly your team can give access and approvals. A setup on a single test wiki with a dedicated Linux host is usually a much shorter engagement than one that covers a production cluster, a large existing store and a formal change process. Rather than rely on a generic figure, ask for a timeline built from your own inventory: number of instances, total attachment size, host availability and the number of review cycles in your change process. The timeline should show when the test wiki is ready, when the first full scan runs and when production cutover happens. Confirm with your XWiki version and ClamAV release that the planned steps match the current documentation.
What does the work need from our team before it starts?
Expect to provide XWiki administrators who can explain how attachments are stored and who owns each wiki, a Linux host for the ClamAV daemon, network access between the wiki application and that host, and a test wiki that resembles production. Typical inputs:
- XWiki admins: availability to confirm configuration, extension versions and where attachments live.
- Linux host: OS version, CPU, memory and disk sized for the scan load, with a service account and patching policy agreed in advance.
- Network access: a documented path from the XWiki servers to the daemon port, reviewed against your segmentation rules.
- Test wiki: a copy with representative attachments so upload blocking and reports can be tested safely.
Agree these inputs in the written scope so that any gap is visible before work begins.
Can our own XWiki team set up ClamAV scanning without outside help?
Yes, a team with Linux administration experience and working knowledge of XWiki administration can often complete a basic setup by following the extension documentation. The harder parts are usually sizing the daemon for a large store, designing alerts and reports that someone acts on, and proving the result to an internal audit or security review. Outside help typically adds value in planning the rollout order, testing blocking behavior on a copy of production, and documenting the configuration so it can be operated later. Before deciding, check whether your team has time for testing and whether anyone will own the daemon after go-live. XWiki SAS publishes consulting and training rates on its pricing page, and those rates can help you compare an internal build with a partner engagement.
What should a fixed-scope quote for this work include?
A useful fixed-scope quote lists the environments in scope, the XWiki instances and attachment stores covered, the ClamAV deployment model and host requirements, the configuration items to be delivered and the testing and documentation you will receive. It should also name what is out of scope, such as changes to unrelated extensions, attachment migration or ongoing monitoring. Ask the provider to state dependencies on your team, the acceptance criteria for each deliverable and how change requests are handled. DeployOpen agreements are fixed-scope and set out in writing before work starts. The quote follows from that written scope, so the more precisely you describe your environment, the more precise the quote can be. Ask for any recurring support, such as signature update checks or daemon upgrades, to be quoted separately.
Does ClamAV scanning on XWiki need ongoing maintenance after go-live?
Yes. The daemon needs its virus signatures updated, its host needs patching, and scheduled full scans need someone to review reports and act on detections. Each of these creates recurring effort that continues after the initial build. Ask who receives administrator reports, how quickly infected attachments are quarantined or removed and how the team will know if the daemon stops responding. Recurring operation can be handled by your team, by a support arrangement or by a retainer. DeployOpen offers ongoing support and upgrades as retainers, and the scope of any retainer should be written down with the same care as the initial build.
How do we confirm the scanning setup works before production?
Test on a copy of your wiki that holds representative attachments, including some known-safe test files that exercise the upload blocking and reporting paths. Confirm that blocked uploads are rejected with a clear message, that scheduled full scans run to completion, and that administrators receive reports they can act on. Also test what happens when the ClamAV daemon is unavailable, because the behavior of the upload path during an outage is a decision your team must make in advance. Record the results so an internal reviewer or auditor can see what was tested and when. Confirm each step against the XWiki and ClamAV documentation for the versions you run.
How DeployOpen scopes and delivers XWiki scanning work
DeployOpen plans, implements, documents and supports self-hosted open-source platforms inside the client's own infrastructure, and attachment scanning follows the same approach. Work starts from a written scope that defines which attachment paths, ClamAV resources and administrator reports are covered, before any configuration changes are made.
How we scope
- Inventory the XWiki version, database variant and attachment volumes that the scanning work must cover.
- Confirm which upload paths, spaces and attachment types the Antivirus Application will check before blocking.
- Agree in writing how ClamAV will be hosted, sized and reached by XWiki, including network paths and resource limits.
- Define the scheduled full scan window, report recipients and the administrator actions that follow a detection.
- Engagements are fixed-scope, with deliverables and timelines agreed in writing before work starts.
How we build
- Deploy the ClamAV daemon in the environment you control and verify that XWiki can reach it from every application node.
- Configure the Antivirus Application for upload blocking and test rejected and accepted files with known-safe test samples.
- Set up scheduled full scans against the existing attachment store and measure how long a complete pass takes.
- Tune ClamAV memory, signature update handling and concurrency based on the attachment volume found during scoping.
- Document configuration, scan schedules and failure behavior so your operators can reproduce the setup.
How we hand over
- Deliver a runbook covering installation steps, configuration values, scheduled jobs and rollback steps for the scanning setup.
- Walk your administrators through reading scan reports, handling quarantined or flagged attachments and escalating findings.
- Record the test cases used for upload blocking and scheduled scans, so they can be rerun after upgrades.
- Hand over ClamAV update, monitoring and capacity notes that name the owner of each recurring task.
- Confirm acceptance against the written scope before the engagement closes.
How we support
- Ongoing support, upgrades and continuous testing are available as retainers after the initial handover.
- Plan re-testing of the Antivirus Application and ClamAV after XWiki upgrades, since extension and daemon versions change independently.
- Review scan duration and ClamAV resource use as the attachment store grows, and recommend sizing changes when needed.
- Confirm with your team and the extension documentation how Antivirus Application versions match your XWiki release before upgrading.
- Ask any support provider to state in writing which versions, response arrangements and recurring tasks are included.
