mediawiki/maps has stored XSS through the overlays parameter in the display_map parser function
Summary
Stored XSS through wikitext can be performed by inserting malicious HTML into the overlays parameter of the display_map parser function when using the leaflet service.
Details
The maps extension doesn't escape overlay names before passing them to leaflet. Leaflet then inserts them as HTML: https://github.com/ProfessionalWiki/Maps/blob/ca5139fabd75f3c34f47ea3fd161306506b053bc/resources/lib/leaflet/leaflet.js#L5243
PoC
Preview the following wikitext, using the default configuration options of the extension:
{{#display_map:0,0|service=leaflet|overlays=OpenTopoMap.<img src=x onerror="alert(1);">}}Impact
Stored XSS can be performed by any user with the edit permission.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | mediawiki/maps | < 12.1.3 | 12.1.3 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L- Weakness (CWE)
CWE-79, CWE-80- Platform
- Composer
- Package
mediawiki/maps- Disclosed
- 02.07.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-4h7g-5542-v3fc - CC BY 4.0
Vulnerability history: mediawiki/maps
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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