GHSA-7xv3-gf2g-498h
Semantic MediaWiki affected by Special:Ask table `sep` parameter reflected XSS
Quick fix
GHSA-7xv3-gf2g-498h — mediawiki/semantic-media-wiki: upgrade to the fixed version with the command below.
composer require mediawiki/semantic-media-wiki:^7.2.0Details
#### 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.
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Affected packages
0Fixed in: 7.2.0composer require mediawiki/semantic-media-wiki:^7.2.0