CVE-2026-84115

Cleo Harmony JWT Refresh Token connections privileges management

Assigner: VulDB
Reserved: 01.09.2026 Published: 01.09.2026 Updated: 01.09.2026

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.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	Low
Attack Complexity	Low	Integrity	Low	Integrity	Low
Attack Requirements	None	Availability	Low	Availability	Low
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS 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
CVSS Score: 8.3

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	Low
User Interaction	None	Availability Impact	Low

CVSS 3.1

CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L/E:P/RL:O/RC:C
CVSS Score: 8.3

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	Low
User Interaction	None	Availability Impact	Low

CVSS 3.0

CVSS Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C
CVSS Score: 7.5

Access Vector	Network	Confidentiality Impact	Partial
Access Complexity	Low	Integrity Impact	Partial
Authentication	None	Availability Impact	Partial

CVSS 2.0

Product Status

Vendor	Cleo
Product	Harmony
Versions	Version 5.8.1.0 is affected Version 5.8.1.1 is affected Version 5.8.1.2 is affected Version 5.8.1.3 is affected Version 5.8.1.4 is affected Version 5.8.1.5 is affected Version 5.8.1.6 is affected Version 5.8.1.7 is affected Version 5.8.1.8 is affected Version 5.8.1.9 is affected Version 5.8.1.10 is affected Version 5.8.1.11 is unaffected

Vendor

Cleo

Product

Harmony

Versions

Version 5.8.1.0 is affected
Version 5.8.1.1 is affected
Version 5.8.1.2 is affected
Version 5.8.1.3 is affected
Version 5.8.1.4 is affected
Version 5.8.1.5 is affected
Version 5.8.1.6 is affected
Version 5.8.1.7 is affected
Version 5.8.1.8 is affected
Version 5.8.1.9 is affected
Version 5.8.1.10 is affected
Version 5.8.1.11 is unaffected

Credits

ilyass-armadin (VulDB User) reporter

References

Problem Types