What’s Vulnerable › Vulnerabilities

CVE-2024-34500

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-05 · updated 2026-06-17
• Weakness: CWE-79

Description

An issue was discovered in the UnlinkedWikibase extension in MediaWiki before 1.39.6, 1.40.x before 1.40.2, and 1.41.x before 1.41.1. XSS can occur through an interface message. Error messages (in the $err var) are not escaped before being passed to Html::rawElement() in the getError() function in the Hooks class.

Affected products

• Fedoraproject Fedora: 40
• Wikimedia Foundation MediaWiki: before 1.39.6; from 1.40.0 before 1.40.2; from 1.41.0 before 1.41.1 — fixed in 1.39.6, 1.40.2, 1.41.1

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.39.6, 1.40.2, 1.41.1. Check the vendor advisory for mitigations.

References

• https://gerrit.wikimedia.org/r/c/mediawiki/extensions/UnlinkedWikibase/+/1002175
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FU2FGUXXK6TMV6R52VRECLC6XCSQQISY/
• https://phabricator.wikimedia.org/T357203
• https://gerrit.wikimedia.org/r/c/mediawiki/extensions/UnlinkedWikibase/+/1002175
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FU2FGUXXK6TMV6R52VRECLC6XCSQQISY/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FU2FGUXXK6TMV6R52VRECLC6XCSQQISY/
• https://phabricator.wikimedia.org/T357203

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