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Vulnerability record · CVE-2026-52854 · published 18 August 2026

CVE-2026-52854: Cross-site scripting vulnerability

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.

8.6 CVSS 3.1 High EPSS 0.58% · top 54.7% CWE-79 · Cross-site scriptingCWE-80 · CWE-80 Deferred
8.6CVSS 3.1 base score
0.58%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
9 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

References

LinkTags
https://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
https://github.com/ProfessionalWiki/Maps/releases/tag/12.1.3
https://github.com/ProfessionalWiki/Maps/security/advisories/GHSA-4h7g-5542-v3fc
https://github.com/ProfessionalWiki/Maps/security/advisories/GHSA-4h7g-5542-v3fc

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Source: NIST National Vulnerability Database (record CVE-2026-52854), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.