---
id: CVE-2026-39924
title: >-
  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 nev…
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 nev…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-613
vendor: Flarum
product: Flarum Framework
affected:
  - framework < 1.8.16
published: '2026-08-05'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T20:35:08.537'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-39924'
references:
  - url: >-
      https://github.com/flarum/framework/commit/5f080293a029d0d273eb9678d597c74ea86a3bcc
    label: disclosure@vulncheck.com
  - url: 'https://github.com/flarum/framework/pull/4546'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/flarum/framework/releases/tag/v1.8.16'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/flarum-session-persistence-via-improper-access-token-revocation
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-05T15:48:45.636552Z'
ingestedAt: '2026-09-10T19:07:39.284Z'
epss: 0.00373
epssPercentile: 0.28522
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.