fkie_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. 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.

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

Affected: Packagist: mediawiki/semantic-media-wiki

#### 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.

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fkie_cve-2026-77606

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