professionalwiki/maps · Security
mediawiki/maps has stored XSS through the overlays parameter in the display_map parser function
- GHSA ID
- GHSA-4h7g-5542-v3fc
- CVE ID
- CVE-2026-52854
- Severity
- high
- Published
- Updated
- CVSS
- 8.6 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
- CVSS v3
- 8.6 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Description
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.
CWEs
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CWE-80 · Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)