CVE-2024-21641: Flarum's Logout Route allows open redirects
First published: Fri Jan 05 2024(Updated: )
### Impact The 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. Some ecosystem extensions modifying the logout route have already been affected. Sample: https://discuss.flarum.org/d/22229-premium-wordpress-integration/526 ### Patches The 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: `composer update --prefer-dist --no-dev -a -W` You can then confirm you run the latest version using: `composer show flarum/core` ### Workarounds Some extensions modifying the logout route can remedy this issue if their implementation is safe. In any case we recommend updating to 1.8.5. ### References For any questions or comments on this vulnerability, please visit https://discuss.flarum.org/ For support questions, create a discussion at https://discuss.flarum.org/t/support. A 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.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| composer/flarum/framework | <1.8.5 | 1.8.5 |
| composer/flarum/core | <1.8.5 | 1.8.5 |
| Flarum Flarum | <1.8.5 |
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Reference Links
- https://github.com/flarum/framework/security/advisories/GHSA-733r-8xcp-w9mr
- https://github.com/flarum/flarum-core/commit/ee8b3b4ad1413a2b0971fdd9e40f812d2a3a9d3a
- https://github.com/flarum/framework/commit/7d70328471cf3091d92d95c382d277aec7996176
- https://nvd.nist.gov/vuln/detail/CVE-2024-21641
- https://github.com/advisories/GHSA-733r-8xcp-w9mr (Advisory)
- collector/github-advisory-latest
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