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Description

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki - GlobalWatchlist Extension allows Cross-Site Scripting (XSS). The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.

PUBLISHED Reserved 2026-04-07 | Published 2026-04-07 | Updated 2026-04-08 | Assigner wikimedia-foundation




MEDIUM: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L

Problem types

CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')

Product status

Default status
affected

1.43
unaffected

1.44
unaffected

1.45
unaffected

Any version before 1.43
affected

Credits

SomeRandomDeveloper finder

References

phabricator.wikimedia.org/T418179

gerrit.wikimedia.org/...b7e1d234b0aaf9f7d782a65da1451577587e

cve.org (CVE-2026-39933)

nvd.nist.gov (CVE-2026-39933)

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