CVE-2026-22710: Stored XSS through autocomment system messages in Wikibase

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-01-09 · updated 2026-06-17
Weakness: CWE-79

Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in The Wikimedia Foundation Mediawiki - Wikibase Extension allows Cross-Site Scripting (XSS).This issue affects Mediawiki - Wikibase Extension: 1.45, 1.44, 1.43, 1.39.

Affected products

The Wikimedia Foundation Mediawiki - Wikibase Extension: 1.39, 1.43, 1.44, 1.45

References

https://gerrit.wikimedia.org/r/q/I39d0074b2ad022b6efe6ab3dd8c8ec0f86c6c466
https://phabricator.wikimedia.org/T409737
https://phabricator.wikimedia.org/T409737

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