CVE-2026-63301 Denial of Service in Quick.CMS
An attacker can cause a Denial of Service in Quick.CMS by deleting the primary language via an unprotected API endpoint, potentially exploiting a CSRF flaw.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-63301?
CVE-2026-63301 is a high-severity missing authorization vulnerability in OpenSolution Quick.CMS, published on 28 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
In Quick.CMS, the administrative user interface restricts deletion of the primary language by omitting the corresponding option from the interface; however, the underlying language-deletion API endpoint does not enforce an equivalent server-side authorization check. As a result, an authenticated administrator can bypass the UI-level restriction and delete the primary language by sending a direct HTTP request to the API endpoint. Successful deletion of the primary language results in a Denial of Service (DoS) of application.
Critically, when combined with a separate Cross-Site Request Forgery (CSRF) vulnerability (CVE-2026-1468) an unauthenticated remote attacker can craft a malicious link, which if visited by an authenticated administrator, will trigger the DoS condition without direct access to the application
The vendor assessed the likelihood of exploitation as very low and determined that a fix is not necessary.
Weakness: CWE-602
Which versions are affected by CVE-2026-63301?
How do I fix CVE-2026-63301?
No fix has been published for CVE-2026-63301 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-63301 being exploited?
There is no known exploitation of CVE-2026-63301 in the wild and no public exploit code.
Sources
Also known as GHSA-4pmv-mf66-4v3h.