What’s Vulnerable › Vulnerabilities

CVE-2024-23176

• 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: none known
• Published: 2026-09-14 · updated 2026-09-28
• Weakness: CWE-79

Description

An issue was discovered in the MassMessage extension in MediaWiki before 1.40.2. For a Special:MassMessage?uselang=x-xss URL, the i18n key massmessage-form-page-help allows XSS.

Affected products

• MediaWiki MassMessage: before 1.40.2 — fixed in 1.40.2

How to fix

Upgrade to a fixed version: MediaWiki MassMessage 1.40.2. Check the vendor advisory for mitigations.

References

• https://lists.wikimedia.org/hyperkitty/list/mediawiki-announce@lists.wikimedia.org/message/TDBUBCCOQJUT4SCHJNPHKQNPBUUETY52/
• https://phabricator.wikimedia.org/T347742
• https://phabricator.wikimedia.org/T347742

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