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TI-2026-28793 Aliases CVE-2026-39924GHSA-4x2h-wcjq-p974

Flarum < 1.8.16 Session Persistence via Improper Access Token Revocation

Priority LOW 33CWE-613Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-613.

Summary

Flarum before 1.8.16 contains an improper session invalidation vulnerability that allows attackers who hold a valid session token to retain full account access after a victim changes their password, because the access_tokens table is never cleared on password change events. The TokensClearer::clearPasswordTokens() function only removes rows from the password_tokens table while leaving all active session cookies and API bearer tokens intact, including long-lived RememberAccessToken entries, and administrator-forced password resets via the user update endpoint are equally ineffective at revoking attacker-held sessions.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00373 31st percentileScored 2026-11-07
Fix Fixed Flarum Framework (Flarum): 1.8.16

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
flarumFlarum Frameworkbefore 1.8.161.8.16Patch availableCNA
  • Flarum Framework Vendorflarum Affected before 1.8.16 Fixed in 1.8.16 Patch available CNA

Remediation

  • Fix · CNA Flarum Framework (Flarum) Fixed in 1.8.16

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Flarum Framework 1.8.16

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-28792 Flarum < 1.8.16 Password Reset Token Expiry Bypass via POST /resetPriority MEDIUM 42
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-39924
  2. 2026-10-03 Alias added: GHSA-4x2h-wcjq-p974

References

Patch 2

Other 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-2026-30290 Flarum: Path traversal in LESS parser via theme color settings (incomplete fix for CVE-2023-27577) CVSS 3.1MEDIUM 4.9
  • TI-2026-23739 flarum/nickname: Display name injection in notification emails (autolink & markdown) CVSS 3.1MEDIUM 4.6
  • TI-2026-28792 Flarum < 1.8.16 Password Reset Token Expiry Bypass via POST /reset CVSS 4.0CRITICAL 9.2
See all 19 →

Sources

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