CVE-2026-52854: mediawiki/maps has stored XSS through the overlays parameter in the display_map parser function

July 2, 2026

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.

References

github.com/ProfessionalWiki/Maps/security/advisories/GHSA-4h7g-5542-v3fc
github.com/advisories/GHSA-4h7g-5542-v3fc
nvd.nist.gov/vuln/detail/CVE-2026-52854

Code Behaviors & Features

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