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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-52854
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-18 22:16:53 UTC
Updated2026-08-19 19:17:18 UTC
DescriptionMaps 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.

Risk And Classification

Primary CVSS: v3.1 8.6 HIGH from [email protected]

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

EPSS: 0.004320000 probability, percentile 0.362420000 (date 2026-08-20)

Problem Types: CWE-79 | CWE-80 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | CWE-80 CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
3.1CNADECLARED8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA ProfessionalWiki Maps affected < 12.1.3 Not specified

References

ReferenceSourceLinkTags
github.com/ProfessionalWiki/Maps/releases/tag/12.1.3 [email protected] github.com
github.com/ProfessionalWiki/Maps/commit/737a993fc2f40499e9bb22198fd1d56c... [email protected] github.com
github.com/ProfessionalWiki/Maps/blob/12.1.3/RELEASE-NOTES.md [email protected] github.com
github.com/ProfessionalWiki/Maps/security/advisories/GHSA-4h7g-5542-v3fc 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/ProfessionalWiki/Maps/pull/899 [email protected] github.com
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