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.
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
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 21 Aug 2026 13:00:00 +0000

Type Values Removed Values Added
First Time appeared Professionalwiki
Professionalwiki maps
Vendors & Products Professionalwiki
Professionalwiki maps

Wed, 19 Aug 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Tue, 18 Aug 2026 21:45:00 +0000

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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-19T18:33:53.281Z

Reserved: 2026-06-08T18:41:27.724Z

Link: CVE-2026-52854

cve-icon Vulnrichment

Updated: 2026-08-19T18:33:31.159Z

cve-icon NVD

Status : Received

Published: 2026-08-18T22:16:53.470

Modified: 2026-08-19T19:17:18.963

Link: CVE-2026-52854

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-21T12:31:45Z

Weaknesses