CVE-2026-33384 Session Fixation in QuickCMS
Attackers can hijack authenticated sessions by fixing session IDs before login, allowing unauthorized access to user accounts in QuickCMS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-33384?
CVE-2026-33384 is a medium-severity authentication bypass vulnerability in OpenSolution QuickCMS, published on 29 May 2026. 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
QuickCMS allows a user's session identifier to be set before authentication. The value of this session ID stays the same after authentication. This behaviour enables an attacker to fix a session ID for a victim and later hijack the authenticated session.
This issue was fixed in a patch to version 6.8 published on 15.05.2026, deployments without this patch are still vulnerable.
Weakness: CWE-384
Which versions are affected by CVE-2026-33384?
How do I fix CVE-2026-33384?
No fix has been published for CVE-2026-33384 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-2026-33384 being exploited?
There is no known exploitation of CVE-2026-33384 in the wild and no public exploit code.
Sources
Also known as GHSA-x6p9-8crm-x3hf.