CVE-2025-53369: Citizen Short Description stored XSS vulnerability through wikitext

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-07-03 · updated 2026-06-17
Weakness: CWE-79

Description

Short Description is a MediaWiki extension that provides local short description support. In version 4.0.0, short descriptions are not properly sanitized before being inserted as HTML using mw.util.addSubtitle, allowing any user to insert arbitrary HTML into the DOM by editing a page. This issue has been patched in version 4.0.1.

Affected products

StarCitizenTools mediawiki-extensions-ShortDescription: from 05f6c6824f8f37dcc2d51cf6df4e7a09bea2196c, < 2c18bd21c5de53c336f55b6ff42f2983ea5796b4; from 4.0.0, < 4.0.1

References

https://github.com/StarCitizenTools/mediawiki-extensions-ShortDescription/commit/bc4fdbaeb1dff127fb6d08c0d385b64aa128c8f8
https://github.com/StarCitizenTools/mediawiki-extensions-ShortDescription/security/advisories/GHSA-p85q-mww9-gwqf

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