Vulnerability · Published Oct 27, 2026 · Assigned by VulnCheck

CVE-2026-116886Semantic MediaWiki before 7.3.1 Stored XSS via External Identifier in Special:Browse

Medium 5.4

In plain English

A medium-severity cross-site scripting in SemanticMediaWiki from SemanticMediaWiki. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.1%top 96.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Semantic MediaWiki from 2.5.0 before 7.3.1 contains a stored cross-site scripting vulnerability that allows users with page-edit rights to inject scripts via External identifier property values. Attackers can annotate markup payloads that ExternalIdentifierValue renders unescaped on Special:Browse, executing JavaScript in viewers' sessions, including administrators.

Affected products (as reported)

Vendor	Product	Versions
SemanticMediaWiki	SemanticMediaWiki	2.5.0 – before 7.3.1

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

GitHub Security Advisory (GHSA-2gfw-3hj2-wfq5) vendor-advisory
VulnCheck Advisory: Semantic MediaWiki before 7.3.1 Stored XSS via External Identifier in Special:Browse third-party-advisory