GHSA-7xv3-gf2g-498h
Semantic MediaWiki affected by Special:Ask table `sep` parameter reflected XSS
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Packagist | mediawiki/semantic-media-wiki | < 7.2.0 | 7.2.0 |
Details
As written in the advisory (Markdown source, shown as plain text).
#### 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
External links from the advisory. They lead to third-party sites.