Privilege Escalation Vulnerability in Cleo Harmony by Cleo
CVE-2026-84115

6.9MEDIUM

Key Information:

Vendor

Cleo

Status
Harmony
Vendor
CVE Published:
1 September 2026

What is CVE-2026-84115?

A vulnerability exists in Cleo Harmony versions up to 5.8.1.10, specifically within the JWT Refresh Token Handler component's function located at /api/connections. This issue allows for improper management of user privileges when manipulating the Bearer argument, making it susceptible to remote exploitation. It has been publicly disclosed, so immediate action is advised. Users should upgrade to version 5.8.1.11 or later to mitigate risks and secure their systems.

Affected Version(s)

Harmony 5.8.1.0

Harmony 5.8.1.1

Harmony 5.8.1.2

References

https://vuldb.com/vuln/397558
vdb-entrytechnical-description
https://vuldb.com/vuln/397558/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-84115
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

ilyass-armadin (VulDB User)
.