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PatchSiren cyber security CVE debrief

CVE-2026-96879 The Wikimedia Foundation CVE debrief

CVE-2026-96879 debrief based on the supplied source corpus. The CVE record describes an improper removal of sensitive information before storage or transfer vulnerability in Wikimedia Foundation's Mediawiki - FlaggedRevs extension through 1.46.0. Defenders should assess their exposure and prioritize remediation. The CVSS score is 6.9, indicating a medium severity vulnerability. Official CVE Program record and NVD detail page provide additional information. Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up. Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Vendor
The Wikimedia Foundation
Product
Mediawiki - FlaggedRevs extension
CVSS
MEDIUM 6.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-25
Original CVE updated
2026-09-25
Advisory published
2026-09-25
Advisory updated
2026-09-25

Who should care

Defenders responsible for Mediawiki installations using the FlaggedRevs extension through version 1.46.0 should assess their exposure and prioritize remediation.

Why it matters

Defenders should prioritize verifying and remediating this vulnerability in their Mediawiki installations, especially those using the FlaggedRevs extension through version 1.46.0, to prevent potential exposure of sensitive information.

  • Potential exposure of sensitive information in Mediawiki installations using the FlaggedRevs extension through version 1.46.0
  • Need for verification of Mediawiki installations to determine potential exposure
  • Remediation priority for vulnerable Mediawiki installations
  • Monitoring of Mediawiki installations for potential exploitation attempts

Technical summary

The CVE record describes an improper removal of sensitive information before storage or transfer vulnerability in Wikimedia Foundation's Mediawiki - FlaggedRevs extension through 1.46.0. The CVSS score is 6.9, indicating a medium severity vulnerability.

Defensive priority

Defenders should prioritize verifying and remediating this vulnerability in their Mediawiki installations, especially those using the FlaggedRevs extension through version 1.46.0.

Recommended defensive actions

  • Verify Mediawiki installations using the FlaggedRevs extension through version 1.46.0 for potential exposure
  • Remediate vulnerable Mediawiki installations by updating the FlaggedRevs extension to a version beyond 1.46.0
  • Monitor Mediawiki installations for potential exploitation attempts

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability, with a CVSS score of 6.9 and a description of an improper removal of sensitive information before storage or transfer vulnerability in Wikimedia Foundation's Mediawiki - FlaggedRevs extension through 1.46.0.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-96879 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-96879

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-96879 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-96879

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://phabricator.wikimedia.org/T433020

    c4f26cc8-17ff-4c99-b5e2-38fc1793eacc

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.