mediawiki/maps: Stored XSS through the overlays parameter in the display_map parser function
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| ProfessionalWiki | Maps | before 12.1.3 | 12.1.3 | Patch available | CNA |
| — | mediawiki/maps (Packagist) | before 12.1.3 | 12.1.3 | Patch available | GHSA-4h7g-5542-v3fc |
- Maps VendorProfessionalWiki Affected before 12.1.3 Fixed in 12.1.3 Patch available CNA
- mediawiki/maps (Packagist) Vendor— Affected before 12.1.3 Fixed in 12.1.3 Patch available GHSA-4h7g-5542-v3fc
Remediation
- Fix · CNA Maps (ProfessionalWiki) Fixed in 12.1.3
- Fix · GHSA-4h7g-5542-v3fc mediawiki/maps (Packagist) Fixed in 12.1.3 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-52854
- 2026-10-03 Alias added: GHSA-4h7g-5542-v3fc
References
Other 6
- https://github.com/ProfessionalWiki/Maps/security/advisories/GHSA-4h7g-5542-v3fc
- https://github.com/ProfessionalWiki/Maps/pull/899
- https://github.com/ProfessionalWiki/Maps/commit/737a993fc2f40499e9bb22198fd1d56c25613806
- https://github.com/ProfessionalWiki/Maps/blob/12.1.3/RELEASE-NOTES.md
- https://github.com/ProfessionalWiki/Maps/releases/tag/12.1.3
- https://github.com/ProfessionalWiki/Maps
Sources
- CVE-2026-52854 · CVE Program
- CVE-2026-52854 · NVD
- FIRST EPSS
- GHSA-4h7g-5542-v3fc · GitHub Advisory Database · CC BY 4.0
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