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

What is CVE-2026-116891?

CVE-2026-116891 is a medium-severity vulnerability in SemanticMediaWiki, published on 27 Oct 2026.

Official 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.

Weakness: CWE-79

Which versions are affected by CVE-2026-116891?

2 open source packages ship an affected version, including mediawiki/semantic-media-wiki. It affects 1 product.

Products include Semantic-Mediawiki Semantic Mediawiki.

How do I fix CVE-2026-116891?

Upgrade mediawiki/semantic-media-wiki to 7.2.1 or later.

Is CVE-2026-116891 being exploited?

There is no known exploitation of CVE-2026-116891 in the wild and no public exploit code.

Other vulnerabilities in SemanticMediaWiki

• CVE-2022-48614 Cross-site Scripting in Semantic MediaWiki Medium 6.1
• CVE-2026-116874 SemanticMediaWiki 3.1.0 before 7.3.1 Reflected XSS via JsonResultPrinter Default Parameter Medium 5.3
• CVE-2026-116875 SemanticMediaWiki 3.0.0 before 7.3.1 Reflected XSS via Special:Ask Separator Parameters Medium 5.3
• CVE-2026-116884 SemanticMediaWiki 5.0.0 before 7.3.1 Stored XSS via Tooltip Module data-* Attributes Medium 5.3
• CVE-2026-116889 SemanticMediaWiki 2.5.0 before 7.3.1 Stored XSS via Special:Browse Code Property Medium 5.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as GHSA-8x9p-9f27-hxfj, GHSA-9rcc-pmj8-ffhr.