CVE-2024-21641

MEDIUMNuclei

Flarum's Logout Route allows open redirects

Title source: CVE List
STIX 2.1 vulnerability

Record summary

CVE-2024-21641 has a selected CVSS score of 6.5 (medium); EIP currently links 1 Nuclei template.

Description

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.

Description source: CVE List

Exploitation context

Available material

Nuclei templates
1

CISA SSVC decision

ExploitationNone
AutomatableNo
Technical impactPartial

CISA Coordinator · SSVC 2.0.3 · Evaluated May 8, 2025 · Source: CVE List

Affected products and versions

3
ProductSourceVersion range

framework

Browse flarum / framework
CVE List< 1.8.5affected

flarum/core

Browse Packagist / flarum/core
GitHub AdvisoryBefore 1.8.5 · Fixed in 1.8.5affected

flarum/framework

Browse Packagist / flarum/framework
GitHub AdvisoryBefore 1.8.5 · Fixed in 1.8.5affected

Nuclei templates

1
ProjectDiscoveryMEDIUMFlarum < 1.8.5 - Open RedirectCVSS 4.7

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.

Impact

Unauthenticated attackers can redirect users to malicious phishing sites using the trusted domain of the Flarum installation.

Remediation

Update Flarum to version 1.8.5 or later.

WeaknessesCWE-601
Authorskking
Template tagscvecve2024flarumredirectvuln
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
CPE: cpe:2.3:a:flarum:flarum:*:*:*:*:*:*:*:*
FOFA: header="flarum_session="
https://github.com/flarum/framework/security/advisories/GHSA-733r-8xcp-w9mr https://github.com/flarum/flarum-core/commit/ee8b3b4ad1413a2b0971fdd9e40f812d2a3a9d3a https://nvd.nist.gov/vuln/detail/CVE-2024-21641

Source: ProjectDiscovery

References

4