High severity8.3NVD Advisory· Published Sep 1, 2026· Updated Sep 1, 2026
CVE-2026-84115
CVE-2026-84115
Description
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.
Affected products
1Patches
Vulnerability mechanics
References
5News mentions
3- ⚡ Weekly Recap: Chrome 0-Day, Router Hijacks, Coder Supply Chain Attack and MoreThe Hacker News · Sep 7, 2026
- Cleo Harmony Flaw Lets Remote Attackers Escalate Privileges via JWT Refresh TokenCyber Security News · Sep 2, 2026
- Exploit Published for Fresh Cleo Harmony VulnerabilitySecurityWeek · Sep 2, 2026