Medium 6.1Published Oct 27, 2026

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

Updated under an hour ago (Oct 29, 2026, 2:10 PM ET)

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It affects SemanticMediaWiki and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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.

CVSS: 6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Oct 27, 2026
First seen by InfoSec Signals: Oct 27, 2026

Affected products

Affected products

SemanticMediaWiki SemanticMediaWiki semanticmediawiki:semanticmediawiki (from the name)	from 4.2.0 before 7.2.1; 7.2.1 not affected	CNA record
semantic-mediawiki semantic_mediawiki semantic-mediawiki:semantic_mediawiki	from 4.2.0 before 7.2.1	NVD

References

References

https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-9rcc-pmj8-ffhr	vendor-advisory, exploit, mitigation
https://www.vulncheck.com/advisories/semanticmediawiki-4.2.0-before-7.2.1-reflected-xss-via-special-facetedsearch-cstate	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.