CVE-2026-52854

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

Published Aug 18, 2026 CVSS 3.1 · 8.6 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-4h7g-5542-v3fc mediawiki/maps has stored XSS through the overlays parameter in the display_map parser function
History
Type Values Removed Values Added
First Time appeared Professionalwiki
Professionalwiki maps
Vendors & Products Professionalwiki
Professionalwiki maps
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title mediawiki/maps: Stored XSS through the overlays parameter in the display_map parser function
Weaknesses CWE-79
CWE-80
References
Metrics cvssV3_1

{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Aug 19, 2026, 6:33 PM
Reserved
Jun 8, 2026, 6:41 PM
Status
Deferred
Published
Aug 18, 2026, 10:16 PM
Modified
Oct 22, 2026, 5:09 PM