Vulnerability · Published Jul 28, 2026 · Assigned by CERT-PL
CVE-2026-63301Denial of Service in Quick.CMS
High 7.0
In plain English
A high-severity security flaw in Quick.CMS from OpenSolution. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| OpenSolution | Quick.CMS | 0 – through 6.8.0 |
Weakness: CWE-602 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
References
- https://cert.pl/en/posts/2026/07/CVE-2026-63301 third-party-advisory
- https://opensolution.org/ product