CVE-2026-33386 XSS in QuickCMS
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-33386?
CVE-2026-33386 is a low-severity vulnerability in OpenSolution QuickCMS, published on 29 May 2026.
Official description
QuickCMS is vulnerable to Cross-Site Scripting (XSS) through its insecure HTTP-based plugin‑fetching mechanism. A malicious attacker can perform a Man‑in‑the‑Middle (MITM) attack by impersonating the opensolution.org server and serving arbitrary HTML or JavaScript at the plugin list endpoint. When a user accesses the plugin page, the malicious content is automatically fetched, rendered, and executed.
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-79
Which versions are affected by CVE-2026-33386?
How do I fix CVE-2026-33386?
No fix has been published for CVE-2026-33386 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-33386 being exploited?
There is no known exploitation of CVE-2026-33386 in the wild and no public exploit code.
Sources
Also known as GHSA-wq6v-xp72-v7h5.