CVE-2026-33384: Opensolution Quickcms

Medium severity, CVSS 4.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Opensolution Quickcms: up to and including 6.8

Published 2026-05-29. Last modified 2026-07-21.