What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-18 · updated 2026-09-24
• Weakness: CWE-79

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 products

• SemanticMediaWiki: before 7.2.0

References

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

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