Vulnerability · Published May 29, 2026 · Assigned by CERT-PL

CVE-2026-33384Session Fixation in QuickCMS

Medium 4.8

In plain English

A medium-severity session fixation in QuickCMS from OpenSolution. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).

Severity (CVSS 4.0)4.8Medium

Exploit odds (30 days)0.2%top 95.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
OpenSolution	QuickCMS	0 – through 6.8

Weakness: CWE-384 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

References

https://cert.pl/posts/2026/05/CVE-2026-33384/ third-party-advisory
https://opensolution.org/home.html product