Read the docs
TI-2024-14366 Aliases CVE-2024-21641GHSA-733r-8xcp-w9mr

Flarum's Logout Route allows open redirects

Priority LOW 31CWE-601Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-601.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01067 64th percentileScored 2026-11-07
Fix Fixed framework (flarum): 1.8.5flarum/core (Packagist): 1.8.5+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
flarumframeworkbefore 1.8.51.8.5Patch availableCNA
—flarum/core (Packagist)before 1.8.51.8.5Patch availableGHSA-733r-8xcp-w9mr
—flarum/framework (Packagist)before 1.8.51.8.5Patch availableGHSA-733r-8xcp-w9mr
  • framework Vendorflarum Affected before 1.8.5 Fixed in 1.8.5 Patch available CNA
  • flarum/core (Packagist) Vendor— Affected before 1.8.5 Fixed in 1.8.5 Patch available GHSA-733r-8xcp-w9mr
  • flarum/framework (Packagist) Vendor— Affected before 1.8.5 Fixed in 1.8.5 Patch available GHSA-733r-8xcp-w9mr

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:flarum:flarum:*:*:*:*:*:*:*:*before 1.8.5Vulnerableflarum
  • cpe:2.3:a:flarum:flarum:*:*:*:*:*:*:*:* Versions before 1.8.5 Vulnerable ·flarum

Remediation

  • Fix · CNA framework (flarum) Fixed in 1.8.5
  • Fix · GHSA-733r-8xcp-w9mr flarum/core (Packagist) Fixed in 1.8.5 Advisory →
  • Fix · GHSA-733r-8xcp-w9mr flarum/framework (Packagist) Fixed in 1.8.5 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-21641
  2. 2026-10-03 Alias added: GHSA-733r-8xcp-w9mr

References

Patch 3

Advisory 1

  • TI-2021-12339 XSS vulnerability with translator CVSS 3.1CRITICAL 10.0
  • TI-2023-08736 Post mentions can be used to read any post on the forum without access control CVSS 3.1HIGH 7.7
  • TI-2025-20573 Flarum Vulnerable to Session Hijacking via Authoritative Subdomain Cookie Overwrite CVSS 3.1MEDIUM 6.8
  • TI-2022-20279 Cross site scripting vulnerability with discussion titles in flarum CVSS 3.1CRITICAL 9.0
  • TI-2019-09878 Flarum before 0.1.0-beta.9 allows CSRF against all POST endpoints, as demonstrated by changing admin settings. CVSS 3.0HIGH 8.8
  • TI-2019-08604 User/Command/ConfirmEmailHandler.php in Flarum before 0.1.0-beta.8 mishandles invalidation of user email tokens. CVSS 3.0HIGH 7.5
See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences