CVE-2023-32318 User session not correctly destroyed on logout

High 7.2 Published 26 May 2023 Updated 14 Jan 2025

Attackers can hijack sessions if logout fails to clear cookies, allowing unauthorized access as the previous user.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2023-32318?

CVE-2023-32318 is a high-severity authentication bypass vulnerability in Nextcloud Nextcloud Server, published on 26 May 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

Nextcloud server provides a home for data. A regression in the session handling between Nextcloud Server and the Nextcloud Text app prevented a correct destruction of the session on logout if cookies were not cleared manually. After successfully authenticating with any other account the previous session would be continued and the attacker would be authenticated as the previously logged in user. It is recommended that the Nextcloud Server is upgraded to 25.0.6 or 26.0.1.

Weakness: CWE-613

Which versions are affected by CVE-2023-32318?

It affects 1 product.

Products include Nextcloud Nextcloud Server.

How do I fix CVE-2023-32318?

No fix has been published for CVE-2023-32318 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2023-32318 being exploited?

There is no known exploitation of CVE-2023-32318 in the wild and no public exploit code.

All Nextcloud Nextcloud Server vulnerabilities

Sources

Also known as GHSA-q8c4-chpj-6v38.