CVE-2026-78357 Insufficient Session Revocation for JWT Authentication
Attackers with valid JWTs retain access after account deactivation or password changes, bypassing session revocation mechanisms in OTRS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-78357?
CVE-2026-78357 is a critical vulnerability in OTRS, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Previously issued authentication tokens are not immediately invalidated when an OTRS agent or customer user account is deactivated or its password is changed. As a result, an existing JWT may remain valid until its regular expiration time, which can be approximately 16 hours.
An attacker who has previously obtained a valid authentication token can therefore continue to access OTRS with the privileges of the affected agent or customer user even after the corresponding account has been deactivated or the user's password has been changed.
The vulnerability does not allow an attacker to obtain authentication tokens by itself. Exploitation requires possession of a previously issued and still valid token. The actual impact depends on the privileges associated with the compromised token. Customer user tokens are limited to the permissions of the affected customer account, while agent tokens may provide access to broader ticket, customer, or administrative functionality depending on the assigned permissions.
This issue affects OTRS:
* 7.0.X * 8.0.X * 2023.X * 2024.X * 2025.X * 2026.X before 2026.7.X
Weakness: CWE-613
Which versions are affected by CVE-2026-78357?
How do I fix CVE-2026-78357?
No fix has been published for CVE-2026-78357 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-78357 being exploited?
There is no known exploitation of CVE-2026-78357 in the wild and no public exploit code.
Sources
Also known as GHSA-f6jh-p427-pjq6, UBUNTU-CVE-2026-78357.