CVE-2026-126564

EUVD-2026-123079
Semantic MediaWiki 2.5.0 before 7.4.1 contains a stored cross-site scripting vulnerability in ValueFormatter::getFormattedSubject() that renders property label segments after a literal   as unescaped markup. Users with page-edit rights can set a preferred property label containing an img onerror payload that executes when anyone, including administrators, views Special:Browse or the smwbrowse API.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.4 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 13.11%
Common Weakness Enumeration
References
https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/7.4.0/src/MediaWiki/Specials/Browse/ValueFormatter.php#L34-L55
https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/c9bf9f25549bb2f5eab916339b267a1732002c4c
https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.4.1
https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-mc5x-2j7v-x8hp
https://www.vulncheck.com/advisories/semantic-mediawiki-2.5.0-before-7.4.1-stored-xss-via-special-browse-factbox-title