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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteTo hunt for CVE-2026-100382, first check whether the optional ExternalData extension is installed, enabled, and running a version earlier than 3.7. Then review access logs for suspicious request sequences and correlate them with newly created or changed PHP files on the server. A matching request by itself does not prove compromise; stronger evidence comes from a timeline that connects requests, filesystem changes, and unauthorized execution or persistence.
What the vulnerability affects
CVE-2026-100382 concerns MediaWiki’s optional ExternalData extension, not MediaWiki core by itself. The surfaced Wikimedia Phabricator search result identifies task T434961 as “CVE-2026-100382: Unauthenticated RCE through wikitext in ExternalData” and shows an August 22, 2026 timestamp. That task title identifies the issue, but the available material does not establish detailed official remediation instructions.
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A public researcher-authored proof-of-concept repository describes an OS command-injection path through ExternalData’s #get_program_data parser function. It identifies versions before 3.7 as affected and says version 3.7 disables the relevant execution class by default. The repository describes its reproduction as a lab-only, loopback-only, authorized test. That demonstration explains a reported mechanism; it is not evidence that a particular MediaWiki site was attacked.
Reporting likewise identifies releases before 3.7 as affected. Treat 3.7 as the reported fixed release, and confirm the current official package and deployment-specific upgrade instructions before changing a production installation. Do not infer exposure from the MediaWiki core version alone.
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Establish whether your site is in scope
- Inventory the extension. Check the deployed MediaWiki installation for ExternalData, and establish whether it is enabled. An extension may be present on disk without being active.
- Determine the deployed version. Use the version information for the actual installed extension, not a package manifest or source tree that may differ from production.
- Compare the result with the reported affected range. Versions earlier than 3.7 are identified as affected in the available reporting and PoC. If you cannot establish the deployed version, treat the uncertainty as unresolved rather than assuming the site is safe.
- Record deployment context. Note which site or nodes use the extension, when the version was deployed, and whether any instances have different configurations. This gives investigators a scope and timeline for log review.
Hunt for possible exploitation evidence
A secondary article proposes a hunting pattern: a request that detects the extension, a cluster of POST requests to the MediaWiki API, and later GET requests for PHP files that may have been created recently. It also recommends correlating access logs with filesystem changes and checking writable, web-served directories. This is a reported hypothesis, not an official signature or a confirmed pattern that every exploitation attempt must follow.
Review request logs as a sequence
- Examine the period before patching or disabling the extension, including the time leading up to any suspicious file creation or server alert.
- Look for related requests in context: possible extension-detection activity, clustered API POSTs, and subsequent requests to PHP files that are unusual for the site or newly present.
- Compare timestamps, paths, methods, and source information across relevant web access logs. A single line surfaced by a filter is only a lead; the available reporting does not establish a complete detector or a universal request signature.
Correlate logs with files and deployment state
- Compare suspicious request times and requested paths with file creation or modification times, especially in locations that are both writable by the web service and served by the web server.
- Inspect unexpected PHP files and changes in extension or skin directories. Compare those areas with a known-good deployment where possible.
- Preserve relevant logs and suspected files before removing or altering them. Keep timestamps and other available metadata intact so they can be compared with the request timeline.
- Check whether an apparent file change is explained by an authorized deployment or maintenance action. Filesystem timestamps alone do not establish who made a change or why.
Interpret findings without overcalling them
Evidence strength depends on correlation. An unusual API request, a request for a PHP file, or a changed file may each have a legitimate explanation. A stronger concern is a coherent timeline linking suspicious requests to an unexplained file appearing or changing in a web-served writable location, followed by requests to that file or other evidence of unauthorized execution.
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- Exposure, not evidence of compromise: ExternalData is enabled at a reported affected version, but you have not found corroborating activity. Remediate the exposure and continue a proportionate review of the relevant period.
- Unresolved lead: Logs or files look unusual, but you cannot connect them to each other or rule out authorized changes. Preserve the evidence and investigate the relevant host and deployment history before reaching a verdict.
- Corroborated compromise: Multiple independent records support unauthorized execution or persistence. Treat this as an incident, not simply an extension-upgrade task.
Choose a remediation path
The available reporting identifies ExternalData 3.7 as the fixed release and also describes disabling the optional extension as an alternative mitigation. Confirm the official current package and your installation’s instructions before upgrading. Choose based on whether the extension is needed, the service impact of disabling it, compatibility and deployment constraints, and whether you can verify the resulting state.
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| Option | When it may fit | What to verify |
|---|---|---|
| Upgrade to the reported fixed release | You need ExternalData and can deploy a compatible updated version. | Confirm the official package and instructions, the deployed extension version on each relevant instance, and whether the extension is enabled. |
| Disable ExternalData | You do not need the extension, or cannot update it immediately. | Confirm it is disabled in the deployed configuration and assess the effect on pages or workflows that depend on it. |
If compromise is confirmed
Fixing or disabling the vulnerable extension reduces the exposure, but it does not demonstrate that an intruder’s changes or persistence have been removed. Preserve evidence, investigate the affected host and timeline, and remove confirmed malicious artifacts through your incident-response process. Check for unauthorized changes beyond the suspected PHP file, including extension and skin directories. Assess which credentials or secrets the compromised service could access and rotate those that may have been exposed. Escalate for broader incident response when evidence supports unauthorized execution or persistence.
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