{"id":"GHSA-hw3m-8j5x-94ff","aliases":["CVE-2026-77609"],"title":"Semantic MediaWiki has an open redirect in Special:URIResolver","description":"#### Failure mode\n\n`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.\n\n#### Remediation\n\n- The resolved target URL is parsed and compared against the current host at the redirect sink.\n- 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.\n\n#### Maintenance note\n\nRedirect 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.","severity":"medium","score":6.1,"published":"2026-09-18T16:51:25.000Z","modified":"2026-09-18T17:00:04.984Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"mediawiki/semantic-media-wiki","ranges":[{"events":[{"introduced":"0"},{"fixed":"7.2.0"}],"type":"ECOSYSTEM"}],"versions":["1.9","1.9-RC1","1.9.0.1","1.9.0.2","1.9.1","1.9.1.1","1.9.2","1.9beta1","2.0","2.0-RC1","2.0-RC2","2.0-RC3","2.1.0","2.1.0-RC1","2.1.1","2.1.2","2.1.3","2.2.0","2.2.0-RC1","2.2.1","2.2.2","2.2.3","2.3.0","2.3.0-RC1","2.3.1","2.4.0","2.4.0-RC1","2.4.1","2.4.2","2.4.3","2.4.4","2.4.5","2.4.6","2.5.0","2.5.0-rc.1","2.5.1","2.5.2","2.5.3","2.5.4","2.5.5","2.5.6","2.5.7","2.5.8","3.0.0","3.0.0-rc.1","3.0.0-rc.2","3.0.1","3.0.2","3.1.0","3.1.0-rc.1","3.1.1","3.1.2","3.1.3","3.1.4","3.1.5","3.1.6","3.2.0","3.2.0-rc.1","3.2.0-rc.2","3.2.1","3.2.2","3.2.3","4.0.0","4.0.1","4.0.2","4.1.0","4.1.1","4.1.2","4.1.3","4.2.0","5.0.0","5.0.1","5.0.2","5.1.0","6.0.0","6.0.1","7.0.0","7.1.0"],"fixed":["7.2.0"]}],"references":["https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-hw3m-8j5x-94ff","https://github.com/SemanticMediaWiki/SemanticMediaWiki","https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.2.0"],"sources":[{"name":"OSV","id":"GHSA-hw3m-8j5x-94ff","modified":"2026-09-18T17:00:04.984597548Z","url":"https://osv.dev/vulnerability/GHSA-hw3m-8j5x-94ff"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1}]}