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GHSA-3jp5-3h47-28qfmedium6.1

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

Impact

When headers=plain, table header text was emitted into via a raw HTML path. User-controlled mainlabel content could therefore become executable HTML.

Source excerpt · OSV

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

Original source description

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