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CVE-2026-39924

Flarum < 1.8.16 Session Persistence via Improper Access Token Revocation

Published: Aug 5, 2026Updated: Aug 5, 2026 Sources: CVE List NVDCWE-613
6.8MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 86.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-613

Affected Products

Flarum
oss-project·SG
Flarum FrameworkOn-prem
Web & CMS Plugins / forum-wiki

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Defense Evasion
Initial Access
View detailed technique mapping

References

https://github.com/flarum/framework/releases/tag/v1.8.16
github.com
https://github.com/flarum/framework/pull/4546
github.com
https://github.com/flarum/framework/commit/5f080293a029d0d273eb9678d597c74ea86a3bcc
github.com
and 1 more references View all →

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