Log in Start free

Vulnerability · Published Sep 1, 2026 · Assigned by VulDB

CVE-2026-84115Cleo Harmony JWT Refresh Token connections privileges management

High 8.3

In plain English

A high-severity privilege mismanagement in Harmony from Cleo. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities).

Severity (CVSS 3.1)8.3High
Exploit odds (30 days)0.5%top 59.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 (as reported)

VendorProductVersions
Cleo Harmony 5.8.1.05.8.1.15.8.1.25.8.1.35.8.1.45.8.1.55.8.1.65.8.1.7

Weakness: CWE-269, CWE-266 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L/E:P/RL:O/RC:C

References