---
cve: "CVE-2026-39924"
severity: "HIGH"
cvss: 7.6
epss: "23%"
vendor: "flarum"
kev: false
exploited: false
published: "2026-08-05 16:16:56"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-14T12:41:43+02:00"
---

# CVE-2026-39924

> 7.6 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- a2260e4a62f21591e1a9ae9b11c7db07c6507766 (Commit)
- 5f080293a029d0d273eb9678d597c74ea86a3bcc (Commit)

## Referenzen

- <https://github.com/flarum/framework/releases/tag/v1.8.16>
- <https://github.com/flarum/framework/pull/4546>
- <https://github.com/flarum/framework/commit/5f080293a029d0d273eb9678d597c74ea86a3bcc>
- <https://www.vulncheck.com/advisories/flarum-session-persistence-via-improper-access-token-revocation>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-39924) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_