Medium severity · published Sep 14, 2026
CVE-2024-23176
An issue was discovered in the MassMessage extension in MediaWiki before 1.40.2
5.4
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
MassMessage · MediaWiki
before 1.40.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-23176
CVE.org
https://www.cve.org/CVERecord?id=CVE-2024-23176
lists.wikimedia.org
https://lists.wikimedia.org/hyperkitty/list/mediawiki-announce@lists.wikimedia.org/message/TDBUBCCOQJUT4SCHJNPHKQNPBUUETY52/
phabricator.wikimedia.org
https://phabricator.wikimedia.org/T347742