Stored Cross-Site Scripting in Semantic MediaWiki by Semantic MediaWiki
CVE-2026-126564

5.1MEDIUM

Key Information:

Vendor

Semanticmediawiki

Status
Semanticmediawiki
Vendor
CVE Published:
11 November 2026

What is CVE-2026-126564?

A stored cross-site scripting vulnerability exists in Semantic MediaWiki versions prior to 7.4.1. This issue arises in the ValueFormatter::getFormattedSubject() function, where property label segments following a literal   are rendered as unescaped markup. If a user with page-edit rights sets a preferred property label containing an img onerror payload, this payload is executed when any user, including administrators, accesses Special:Browse or the smwbrowse API, potentially exposing the site to malicious scripts.

Affected Version(s)

SemanticMediaWiki 2.5.0 < 7.4.1

SemanticMediaWiki 7.4.1

References

https://github.com/SemanticMediaWiki/SemanticMediaWiki/se...
vendor-advisory
https://github.com/SemanticMediaWiki/SemanticMediaWiki/co...
patch
https://github.com/SemanticMediaWiki/SemanticMediaWiki/re...
release-notes

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

AlpetGexha
.