GitHub Advisoryadvisory · Packagist

GHSA-3jp5-3h47-28qf Semantic MediaWiki has reflected XSS in Special:Ask plain table headers

MEDIUM Published 2026-09-18 Modified 2026-09-18 Official page ↗
Aliases
CVE-2026-77606
Ecosystem
Packagist
Packages
mediawiki/semantic-media-wiki
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weaknesses
CWE-79
Reviewed
2026-09-18

Affected packages

• Packagist mediawiki/semantic-media-wiki: < 7.2.0 → fixed in 7.2.0

Description

Failure mode When `headers=plain`, table header text was emitted into `` via a raw HTML path. User-controlled `mainlabel` content could therefore become executable HTML. Remediation • `TableResultPrinter` now applies output-context escaping before passing plain headers to the table renderer. • The fix is limited to the HTML/plain-header branch so safe rendering modes are unaffected. Why this is the right layer The header value is not a structural token; it is display data. Sanitizing it at the sink is correct because the renderer owns the final HTML emission.

Related

Alias · CVE (1)

  • CVE-2026-77606 Semantic MediaWiki is a free, open-source extension to MediaWiki that lets users store and query data within the wiki's pages. vulnerability

Weakness · CWE (1)

  • CWE-79 Improper Neutralization of Input During Web Page Generation weakness

References