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Medium severity · published Oct 27, 2026
CVE-2026-116891
SemanticMediaWiki 4.2.0 before 7.2.1 Reflected XSS via Special:FacetedSearch cstate
New
6.1
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
SemanticMediaWiki · SemanticMediaWiki
4.2.0 before 7.2.1 · source: vendor
SM
Semantic Mediawiki · Semantic-mediawiki
4.2.0 before 7.2.1 · source: NVD
Affected product
SE
SemanticMediaWiki
SemanticMediaWiki
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116891
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116891
github.com
https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-9rcc-pmj8-ffhr
www.vulncheck.com
https://www.vulncheck.com/advisories/semanticmediawiki-4.2.0-before-7.2.1-reflected-xss-via-special-facetedsearch-cstate
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