Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation MediaWiki - ProofreadPage Extension allows X…

Code

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Timeline

Detection, updates, and resolution for this record.

1. Apr 7, 2026 · NIST NVD

   Detected

   Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation MediaWiki - ProofreadPage Extension allows XSS Targeting Non-Script Elements. The issue has been remediated on the branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.

2. Jul 21, 2026 · NIST NVD

   Updated

   Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation MediaWiki - ProofreadPage Extension allows XSS Targeting Non-Script Elements. The issue has been remediated on the branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.

Sources

• CVE.orgVulnerability recordCVE-2026-39838

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-39838

  Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation MediaWiki - ProofreadPage Extension allows XSS Targeting Non-Script Elements. The issue has been remediated on the branch, and in the release branch

  nvd.nist.gov

References

• Reference · gerrit.wikimedia.org
• Reference · phabricator.wikimedia.org