Vulnerability intelligence

CVE-2026-84115

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.

CVSS Score

8.3

High

EPSS — Exploit Probability

0.5%

Riskier than 39% of all CVEs · checked 2026-10-16

Exploitation

Not in CISA KEV

KEV does not include every exploited vulnerability

Remediation

Patch available

Vendor fix published

NVD entry Vendor patch PoC / advisory

1 article across 1 outlet · first covered Sep 2, 2026 · latest Sep 2, 2026

Coverage timeline

Exploit Published for Fresh Cleo Harmony Vulnerability
www.securityweek.com · Sep 2, 2026