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PatchSiren cyber security CVE debrief

CVE-2026-96874 The Wikimedia Foundation CVE debrief

A cross-site scripting vulnerability in the Mediawiki - Cargo extension allows Stored XSS. This issue affects Mediawiki - Cargo extension: through 3.9.4. Defenders responsible for Mediawiki installations with the Cargo extension should assess exposure and prioritize verification of the extension version in use. The vulnerability allows attackers to inject malicious scripts, potentially leading to unauthorized actions or data breaches. To mitigate this risk, defenders should verify the version of the Mediawiki - Cargo extension in use and assess the exposure of user-input data.

Vendor
The Wikimedia Foundation
Product
Mediawiki - Cargo extension
CVSS
LOW 2.3
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 with the Cargo extension should assess exposure and prioritize verification of the extension version in use.

Why it matters

A cross-site scripting vulnerability in the Mediawiki - Cargo extension allows Stored XSS, affecting Mediawiki - Cargo extension through 3.9.4. Defenders should prioritize verifying the version in use and assessing exposure of user-input data.

  • Defenders need to verify the version of the Mediawiki - Cargo extension in use to determine exposure
  • User-input data may be vulnerable to exploitation
  • Defenders should consider upgrading to a fixed version if available

Technical summary

The Mediawiki - Cargo extension is vulnerable to Stored XSS due to improper neutralization of input during web page generation. This vulnerability occurs because the extension does not adequately sanitize user input, allowing attackers to inject malicious scripts. As a result, defenders need to verify the version of the Mediawiki - Cargo extension in use to determine exposure and consider upgrading to a fixed version if available.

Defensive priority

Defenders should prioritize verifying the version of the Mediawiki - Cargo extension in use and assessing the exposure of user-input data.

Recommended defensive actions

  • Verify the version of the Mediawiki - Cargo extension in use
  • Assess the exposure of user-input data
  • Consider upgrading to a fixed version if available

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability, but do not specify which versions are fixed or provide additional details on exploitation.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-96874 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-96874

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

  • CVE-2026-96874 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-96874

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

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://gerrit.wikimedia.org/g/mediawiki/extensions/Cargo

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

  • Source reference

    Unverified legacy reference

    URL: https://phabricator.wikimedia.org/T435207

    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.