CVE-2026-52854
HighCVSS 8.6Exploitation Probability (EPSS)
Low risk36th percentile - higher than 36% of all known CVEs
Summary
Vulnerability in the Maps extension for MediaWiki (before 12.1.3) in the display_map function, which accepts attacker-controlled HTML in the overlays parameter. A user with edit permission can store malicious wikitext that executes scripts in other users' browsers.
Risk Assessment
An attacker can execute script in the victim's browser session, enabling data theft or actions on behalf of the victim.
Recommendation
Update the Maps extension to version 12.1.3 or later. Restrict edit permissions for untrusted users.
Original NVD description (English source)
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.