Vulnerability · Published Sep 18, 2026 · Assigned by GitHub_M

CVE-2026-77606Semantic MediaWiki has reflected XSS in Special:Ask plain table headers

Medium 6.1

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 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.3%top 81.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Semantic MediaWiki is a free, open-source extension to MediaWiki that lets users store and query data within the wiki's pages. Prior to version 7.2.0, when `headers=plain`, table header text was emitted into `<th>` via a raw HTML path. User-controlled `mainlabel` content could therefore become executable HTML. Version 7.2.0 fixes the issue.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	mediawiki/semantic-media-wiki	7.2.0	GHSA-3jp5-3h47-28qf

Affected products (as reported)

Vendor	Product	Versions
SemanticMediaWiki	SemanticMediaWiki	< 7.2.0

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

References

https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-3jp5-3h47-28qf x_refsource_CONFIRM
https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.2.0 x_refsource_MISC