CVE-2026-52854 PUBLISHED

mediawiki/maps: Stored XSS through the overlays parameter in the display_map parser function

Assigner: GitHub_M
Reserved: 08.06.2026 Published: 18.08.2026 Updated: 18.08.2026

Maps is a MediaWiki extension that enables visualization of geographic data through dynamic embedded maps. Prior to version 12.1.3, the display_map parser function in the Leaflet service accepts attacker-controlled HTML in the overlays parameter, and resources/leaflet/jquery.leaflet.js uses the overlay name as a Leaflet layer-control label without escaping it. A wiki user with the edit permission can store malicious wikitext that causes script execution when another user previews or views the affected map. The script executes in the viewing user's browser session and can access data or perform actions available to that user. This issue is fixed in version 12.1.3.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
CVSS Score: 8.6

Product Status

Vendor ProfessionalWiki
Product Maps
Versions
  • Version < 12.1.3 is affected

References

Problem Types

  • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CWE
  • CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) CWE