What is CVE-2026-84115?

CVE-2026-84115 is a high-severity vulnerability in Cleo Harmony, classified under Incorrect Privilege Assignment. CVSS score: 8.3/10. Published 2026-09-01.

How severe is CVE-2026-84115?

High severity. CVSS v3 base score is 8.3 out of 10.

Privilege escalation in Cleo Harmony

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 v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L.

Affected products

Cleo Harmony — versions 5.8.1.0, 5.8.1.1, 5.8.1.10

Weakness classification (CWE)

References

cna@vuldb.com (patch, broken-link)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)

Frequently asked questions

What is CVE-2026-84115?: CVE-2026-84115 is a high-severity vulnerability in Cleo Harmony, classified under Incorrect Privilege Assignment. CVSS score: 8.3/10. Published 2026-09-01.
How severe is CVE-2026-84115?: High severity. CVSS v3 base score is 8.3 out of 10.