GHSA-3jp5-3h47-28qf
Semantic MediaWiki has reflected XSS in Special:Ask plain table headers
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
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
External links from the advisory. They lead to third-party sites.