CVE-2026-52854

HIGH 8.6

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

CVSS Score

8.6

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79 CWE-80
Vendor	professionalwiki
Product	maps
Published	Aug 18, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

Low

Affected Versions

ProfessionalWiki / Maps

< 12.1.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/ProfessionalWiki/Maps/security/advisories/GHSA-4h7g-5542-v3fc github.com: https://github.com/ProfessionalWiki/Maps/pull/899 github.com: https://github.com/ProfessionalWiki/Maps/commit/737a993fc2f40499e9bb22198fd1d56c25613806 github.com: https://github.com/ProfessionalWiki/Maps/blob/12.1.3/RELEASE-NOTES.md github.com: https://github.com/ProfessionalWiki/Maps/releases/tag/12.1.3