What’s Vulnerable › Vulnerabilities

CVE-2026-100245: Stored XSS on Wikibase Special:SetSiteLink via unescaped system message

• Severity: medium (CVSS 6.1 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: none known
• Published: 2026-09-29 · updated 2026-09-30
• Weakness: CWE-79

Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - Wikibase Extension allows Stored XSS. This issue affects Mediawiki - Wikibase Extension: from * before 1.46.1, 1.45.5, 1.43.10.

Affected products

• Wikimedia Foundation Mediawiki - Wikibase Extension: before 1.46.1, 1.45.5, 1.43.10 — fixed in 1.43.10, 1.45.5, 1.46.1

How to fix

Upgrade to a fixed version: Wikimedia Foundation Mediawiki - Wikibase Extension 1.43.10, 1.45.5, 1.46.1. Check the vendor advisory for mitigations.

References

• https://gerrit.wikimedia.org/r/q/If871fa7684d42dae057c0517d4a17132cd7aefeb
• https://phabricator.wikimedia.org/T432877

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