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.
https://phabricator.wikimedia.org/T347742
https://lists.wikimedia.org/hyperkitty/list/[email protected]/message/TDBUBCCOQJUT4SCHJNPHKQNPBUUETY52/
https://euvd.enisa.europa.eu/vulnerability/EUVD-2024-55763
Source: Mitre, NVD
Published: 2026-09-14
Updated: 2026-09-28
Base Score: 5.5
Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:N
Severity: Medium
Base Score: 5.4
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
EPSS: 0.00171