{"id":"CVE-2024-21641","aliases":["GHSA-733r-8xcp-w9mr"],"url":"https://o3.security/vulnerability/CVE-2024-21641","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.","published":"2024-01-05T21:02:56.513Z","modified":"2026-08-12T03:51:48.082064339Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"},"epss":{"score":0.01067,"percentile":0.6316,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"flarum/core","fixedVersion":"1.8.5"},{"ecosystem":"Packagist","name":"flarum/framework","fixedVersion":"1.8.5"}],"fix":{"url":"https://github.com/flarum/flarum-core/commit/ee8b3b4ad1413a2b0971fdd9e40f812d2a3a9d3a","label":"flarum/flarum-core@ee8b3b4"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/21xxx/CVE-2024-21641.json"},{"type":"ADVISORY","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":"FIX","url":"https://github.com/flarum/flarum-core/commit/ee8b3b4ad1413a2b0971fdd9e40f812d2a3a9d3a"},{"type":"FIX","url":"https://github.com/flarum/framework/commit/7d70328471cf3091d92d95c382d277aec7996176"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:48.082064339Z"}}