CVE-2026-126564

MEDIUM 5.4

Semantic MediaWiki 2.5.0 before 7.4.1 Stored XSS via Special:Browse Factbox Title

CVSS Score

5.4

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	semanticmediawiki
Product	semanticmediawiki
Published	Nov 11, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

SemanticMediaWiki / SemanticMediaWiki

2.5.0 < 7.4.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-mc5x-2j7v-x8hp github.com: https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/c9bf9f25549bb2f5eab916339b267a1732002c4c github.com: https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.4.1 github.com: https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/7.4.0/src/MediaWiki/Specials/Browse/ValueFormatter.php#L34-L55 vulncheck.com: https://www.vulncheck.com/advisories/semantic-mediawiki-2.5.0-before-7.4.1-stored-xss-via-special-browse-factbox-title

Credits

AlpetGexha