CVE-2024-21641

Flarum's Logout Route allows open redirects

Flarum is open source discussion platform software. Prior to version 1.8.5, 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. 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. The vulnerability has been fixed and published as flarum/core v1.8.5. As a workaround, some extensions modifying the logout route can remedy this issue if their implementation is safe.

Affected

flarum · framework

CVSS v3.1 NVD

4.7 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

CVSS v3.1 GITHUB

6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

EPSS

1.07% chance of exploitation in the next 30 days, 64th percentile

Nuclei

medium · CWE-601

Published

2024-01-05

Updated

2025-06-03

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2024/CVE-2024-21641.yaml

Security advisories

• flarum/framework/security/advisories/GHSA-733r-8xcp-w9mr
• advisories/GHSA-733r-8xcp-w9mr
• flarum/flarum-core/commit/ee8b3b4ad1413a2b0971fdd9e40f812d2a3a9d3a
• flarum/framework/commit/7d70328471cf3091d92d95c382d277aec7996176

References

• CVE Record
• NVD entry