CVE-2026-52854 mediawiki/maps: Stored XSS through the overlays parameter in the display_map parser function

Maps is a MediaWiki extension that enables visualization of geographic data through dynamic embedded maps. Prior to version 12.1.3, the displaymap parser function in the Leaflet service accepts attacker-controlled HTML in the overlays parameter, and resources/leaflet/jquery.leaflet.js uses the...