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CVE-2026-77606

Packagist · mediawiki/semantic-media-wiki

Summary

Semantic MediaWiki has reflected XSS in Special:Ask plain table headers

Advisory details

Failure mode

When headers=plain, table header text was emitted into <th> 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.

References

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