CVE-2026-63301

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.

We have discovered 1,406 live websites that are affected by CVE-2026-63301.

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Affected Software

Product	Quick.CMS
Category	Content Management System
Vulnerable Domains	1,406 live websites (100% of Quick.CMS install base)
Vulnerable Versions	from 0 through 6.8
Vulnerable Versions Count	15 versions ( 100% of all versions)