A vulnerability was found in Checkmk up to 2.2.0/2.3.0p47/2.4.0p30/2.5.0p4 . It has been declared as problematic . This issue affects some unknown processing of the component URL Validation Handler . The manipulation results in cross site scripting. This vulnerability is identified as CVE-2026-8833 . The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.