# 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.

- **Severity:** Medium 4.8 (`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`)
- **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 available:** No
- **Published:** 29 May 2026
- **Updated:** 29 May 2026
- **Also known as:** GHSA-x6p9-8crm-x3hf

## 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 (Session Fixation)

## 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.

## Is CVE-2026-33384 being exploited?

There is no known exploitation of CVE-2026-33384 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-33384 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-33384 in the wild and no public exploit code.

Affected product: OpenSolution QuickCMS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-33384/ (Markdown: https://insights.sbomify.com/CVE-2026-33384/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33384
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33384
- OSV: https://osv.dev/vulnerability/CVE-2026-33384

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-33384/
Summaries are generated and may contain mistakes; the official description above is the record.