A vulnerability was found in Cleo Harmony up to 5.8.1.10. The affected element is an unknown function of the file /api/connections of the component JWT Refresh Token Handler. Performing a manipulation of the argument Bearer results in improper privilege management. The attack is possible to be carried out remotely. The exploit has been made public and could be used. Upgrading to version 5.8.1.11 is sufficient to fix this issue. It is recommended to upgrade the affected component.

A vulnerability was identified in Cleo Harmony versions up to 5.8.1.10 affecting the JWT Refresh Token Handler component at the /api/connections endpoint. The flaw allows manipulation of the Bearer argument, leading to improper privilege management. The vulnerability is remotely exploitable and a public exploit has been released, increasing the risk of active exploitation. Affected users are advised to upgrade to version 5.8.1.11, which resolves the issue. The vulnerability has been assigned CVE-2026-84115 and is tracked by both NVD and VulDB.