Cleo Harmony JWT Refresh Token connections privileges management

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-84115
StatePUBLISHED
AssignerVulDB
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-01 15:17:41 UTC
Updated2026-09-01 20:47:54 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v4.0 5.5 MEDIUM from [email protected]

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-266 | CWE-269 | CWE-269 Improper Privilege Management | CWE-266 Incorrect Privilege Assignment

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary5.5MEDIUMCVSS: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/C...
4.0CNADECLARED6.9MEDIUMCVSS: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
3.1[email protected]Secondary8.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
3.1CNADECLARED8.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L/E:P/RL:O/RC:C
3.0CNADECLARED8.3HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L/E:P/RL:O/RC:C
2.0[email protected]Secondary7.5AV:N/AC:L/Au:N/C:P/I:P/A:P
2.0CNADECLARED7.5AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Sub Conf.
Low
Sub Integrity
Low
Sub Availability
Low

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

CVSS v3.0 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cleo Harmony affected 5.8.1.0 Not specified
CNA Cleo Harmony affected 5.8.1.1 Not specified
CNA Cleo Harmony affected 5.8.1.2 Not specified
CNA Cleo Harmony affected 5.8.1.3 Not specified
CNA Cleo Harmony affected 5.8.1.4 Not specified
CNA Cleo Harmony affected 5.8.1.5 Not specified
CNA Cleo Harmony affected 5.8.1.6 Not specified
CNA Cleo Harmony affected 5.8.1.7 Not specified
CNA Cleo Harmony affected 5.8.1.8 Not specified
CNA Cleo Harmony affected 5.8.1.9 Not specified
CNA Cleo Harmony affected 5.8.1.10 Not specified
CNA Cleo Harmony unaffected 5.8.1.11 Not specified

References

ReferenceSourceLinkTags
vuldb.com/vuln/397558/cti [email protected] vuldb.com
vuldb.com/vuln/397558 [email protected] vuldb.com
vuldb.com/submit/882468 134c704f-9b21-4f2e-91b3-4a467353bcc0 vuldb.com
vuldb.com/cve/CVE-2026-84115 [email protected] vuldb.com
support.cleo.com/hc/en-us/articles/30258468834583-Cleo-Harmony-5-8-1-Release-N... [email protected] support.cleo.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: ilyass-armadin (VulDB User) (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-09-01T00:00:00.000ZAdvisory disclosed
CNA2026-09-01T02:00:00.000ZVulDB entry created
CNA2026-09-01T09:25:49.000ZVulDB entry last update

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