CVE-2026-52854
High · CVSS 8.6Published 2026-08-18
CVSS
8.6
High
EPSS
—
exploit probability
Active Exploit
No
not yet listed
What is CVE-2026-52854?
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.
CVSS Score Explained
CVSS 8.6 is High severity. Exploitation is likely straightforward and the impact is significant — data loss, privilege escalation, or remote code execution are common outcomes. Patch as soon as possible.
EPSS Exploitation Probability
No EPSS score yet — model needs more data on this CVE.
References & Patches
- PATCHhttps://github.com/ProfessionalWiki/Maps/blob/12.1.3/RELEASE-NOTES.md
- ›https://github.com/ProfessionalWiki/Maps/commit/737a993fc2f40499e9bb22198fd1d56c25613806
- ›https://github.com/ProfessionalWiki/Maps/pull/899
- PATCHhttps://github.com/ProfessionalWiki/Maps/releases/tag/12.1.3
- ›https://github.com/ProfessionalWiki/Maps/security/advisories/GHSA-4h7g-5542-v3fc
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