{"id":"GHSA-733r-8xcp-w9mr","summary":"Flarum's logout Route allows open redirects","details":"### Impact\nThe Flarum `/logout` route includes a redirect parameter that allows any third party to redirect users from a (trusted) domain of the Flarum installation to redirect to any link. Sample: `example.com/logout?return=https://google.com`. For logged-in users, the logout must be confirmed. Guests are immediately redirected. This could be used by spammers to redirect to a web address using a trusted domain of a running Flarum installation.\n\nSome ecosystem extensions modifying the logout route have already been affected. Sample: https://discuss.flarum.org/d/22229-premium-wordpress-integration/526\n\n### Patches\nThe vulnerability has been fixed and published as flarum/core v1.8.5. All communities running Flarum should upgrade as soon as possible to v1.8.5 using:\n\n`composer update --prefer-dist --no-dev -a -W`\n\nYou can then confirm you run the latest version using:\n\n`composer show flarum/core`\n\n### Workarounds\nSome extensions modifying the logout route can remedy this issue if their implementation is safe. In any case we recommend updating to 1.8.5.\n\n### References\nFor any questions or comments on this vulnerability, please visit https://discuss.flarum.org/\n\nFor support questions, create a discussion at https://discuss.flarum.org/t/support.\n\nA reminder that if you ever become aware of a security issue in Flarum, please report it to us privately by emailing [security@flarum.org](mailto:security@flarum.org), and we will address it promptly.","aliases":["CVE-2024-21641"],"modified":"2026-09-10T03:50:09.257139836Z","published":"2024-01-05T20:53:17Z","database_specific":{"cwe_ids":["CWE-601"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2024-01-05T20:53:17Z","nvd_published_at":"2024-01-05T21:15:43Z"},"references":[{"type":"WEB","url":"https://github.com/flarum/framework/security/advisories/GHSA-733r-8xcp-w9mr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-21641"},{"type":"WEB","url":"https://github.com/flarum/flarum-core/commit/ee8b3b4ad1413a2b0971fdd9e40f812d2a3a9d3a"},{"type":"WEB","url":"https://github.com/flarum/framework/commit/7d70328471cf3091d92d95c382d277aec7996176"}],"affected":[{"package":{"name":"flarum/core","ecosystem":"Packagist","purl":"pkg:composer/flarum/core"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.5"}]}],"versions":["v0.1.0-beta","v0.1.0-beta.10","v0.1.0-beta.11","v0.1.0-beta.11.1","v0.1.0-beta.12","v0.1.0-beta.13","v0.1.0-beta.14","v0.1.0-beta.14.1","v0.1.0-beta.15","v0.1.0-beta.16","v0.1.0-beta.2","v0.1.0-beta.3","v0.1.0-beta.4","v0.1.0-beta.5","v0.1.0-beta.6","v0.1.0-beta.7","v0.1.0-beta.7.1","v0.1.0-beta.7.2","v0.1.0-beta.8","v0.1.0-beta.8.1","v0.1.0-beta.8.2","v0.1.0-beta.9","v1.0.0","v1.0.1","v1.0.2","v1.0.3","v1.0.4","v1.1.0","v1.1.1","v1.2.0","v1.2.1","v1.3.0","v1.3.1","v1.4.0","v1.4.1","v1.5.0","v1.6.0","v1.6.1","v1.6.2","v1.6.3","v1.7.0","v1.7.1","v1.7.2","v1.8.0","v1.8.1","v1.8.2","v1.8.3","v1.8.4"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/01/GHSA-733r-8xcp-w9mr/GHSA-733r-8xcp-w9mr.json"}},{"package":{"name":"flarum/framework","ecosystem":"Packagist","purl":"pkg:composer/flarum/framework"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.5"}]}],"versions":["v0.1.0-beta","v0.1.0-beta.10","v0.1.0-beta.11","v0.1.0-beta.11.1","v0.1.0-beta.12","v0.1.0-beta.13","v0.1.0-beta.14","v0.1.0-beta.14.1","v0.1.0-beta.15","v0.1.0-beta.16","v0.1.0-beta.2","v0.1.0-beta.3","v0.1.0-beta.4","v0.1.0-beta.5","v0.1.0-beta.6","v0.1.0-beta.7","v0.1.0-beta.7.1","v0.1.0-beta.7.2","v0.1.0-beta.8","v0.1.0-beta.8.1","v0.1.0-beta.8.2","v0.1.0-beta.9","v1.0.0","v1.0.1","v1.0.2","v1.0.3","v1.0.4","v1.1.0","v1.1.1","v1.2.0","v1.2.1","v1.3.0","v1.3.1","v1.4.0","v1.5.0","v1.6.0","v1.6.1","v1.6.2","v1.6.3","v1.7.0","v1.7.1","v1.8.0","v1.8.1","v1.8.2","v1.8.3"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/01/GHSA-733r-8xcp-w9mr/GHSA-733r-8xcp-w9mr.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"}]}