GHSA-hw3m-8j5x-94ff Semantic MediaWiki has an open redirect in Special:URIResolver

• Packagist mediawiki/semantic-media-wiki: < 7.2.0 → fixed in 7.2.0

Failure mode `Special:URIResolver` resolves its user-controlled subpage to a MediaWiki title and issues an HTTP 303 redirect to `$title->getFullURL()` without validating the resolved target. A crafted subpage can make that target point off-host: an interwiki prefix redirects to the foreign wiki (for example `Special:URIResolver/mw-3AFoo`, which decodes to `mw:Foo`, redirects to `https://www.mediawiki.org/wiki/Foo`), and where the resolved URL carries an authority the target can even embed `user:pass@host` credentials. The result is an open redirect to an attacker-influenced host, usable for phishing from a trusted wiki URL. Remediation • The resolved target URL is parsed and compared against the current host at the redirect sink. • The redirect is rejected (bad-title error page) when a user or pass component is present, or when the host does not match the current host. Maintenance note Redirect code must validate the final target URL, not just the input path. Host comparison belongs at the redirect sink: each sink (special page, entry point) must validate its own target rather than relying on upstream normalisation.