CVE-2026-39838
Description
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 `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.
CWE
- CWE-79 — CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')
Affected
- Wikimedia Foundation / MediaWiki - ProofreadPage Extension — v=0 <1.43 [affected]; v=1.43 [unaffected]; v=1.44 [unaffected]; v=1.45 [unaffected]
CVSS
- 4.0 score=6.9 severity=MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N
References
- https://phabricator.wikimedia.org/T406088
- https://gerrit.wikimedia.org/r/q/Idd51e18479b32b7176b43ff74ca1c49d6bdd0628
Source
cvelistV5-main/cves/2026/39xxx/CVE-2026-39838.json