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CVE-2026-77607

Packagist · mediawiki/semantic-media-wiki

Summary

Semantic MediaWiki affected by Special:Ask table `sep` parameter reflected XSS

Advisory details

Failure mode

sep was inserted verbatim into the HTML that joins a table cell's values. This made it possible to inject HTML through the separator value. The same unsanitised table HTML is produced both for the standard Special:Ask render and for its raw request output (request_type=raw), so the injection was reachable without authentication.

Remediation

  • In all non-wiki output modes (HTML, raw request, file), sep is escaped unless it is a safe <br> variant.
  • This preserves legitimate line-break separators while blocking markup injection.

Maintenance note

If the table renderer ever gains richer separator semantics, keep the whitelist explicit. Do not expand the allowed HTML surface casually.

References

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