What’s Vulnerable › Vulnerabilities

CVE-2026-116891: SemanticMediaWiki 4.2.0 before 7.2.1 Reflected XSS via Special:FacetedSearch cstate

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-10-27 · updated 2026-10-28
• Weakness: CWE-79

Description

SemanticMediaWiki from 4.2.0 before 7.2.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject HTML via unescaped cstate parameters in Special:FacetedSearch. Attackers can craft URLs with q, a matching crc32 csum or filtered=1, and cstate values that break out of hidden input attributes to execute script in victims' browsers.

Affected products

• Semantic-Mediawiki Semantic Mediawiki: from 4.2.0 before 7.2.1 — fixed in 7.2.1
• SemanticMediaWiki: from 4.2.0 before 7.2.1 — fixed in 7.2.1

How to fix

Upgrade to a fixed version: Semantic-Mediawiki Semantic Mediawiki 7.2.1; SemanticMediaWiki 7.2.1. Check the vendor advisory for mitigations.

References

• https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-9rcc-pmj8-ffhr
• https://www.vulncheck.com/advisories/semanticmediawiki-4.2.0-before-7.2.1-reflected-xss-via-special-facetedsearch-cstate

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