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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact Low

Subsequent System Availability Impact Low

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Cleo Harmony affected
Version Status Constraints
5.8.1.0 affected —
5.8.1.1 affected —
5.8.1.2 affected —
5.8.1.3 affected —
5.8.1.4 affected —
5.8.1.5 affected —
5.8.1.6 affected —
5.8.1.7 affected —
5.8.1.8 affected —
5.8.1.9 affected —
5.8.1.10 affected —
5.8.1.11 unaffected —

No data.

No data.

No data.

Project Subscriptions

Vendors Products
Cleo Subscribe
Harmony Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://support.cleo.com/hc/en-us/articles/30258468834583-Cleo-Harmony-5-8-1-Release-Notes#Version58111 cve-icon
https://vuldb.com/cve/CVE-2026-84115 cve-icon
https://vuldb.com/submit/882468 cve-icon
https://vuldb.com/vuln/397558 cve-icon
https://vuldb.com/vuln/397558/cti cve-icon
History

Tue, 01 Sep 2026 15:15:00 +0000

Type Values Removed Values Added
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.
Title Cleo Harmony JWT Refresh Token connections privileges management
First Time appeared Cleo
Cleo harmony
Weaknesses CWE-266
CWE-269
CPEs cpe:2.3:a:cleo:harmony:*:*:*:*:*:*:*:*
Vendors & Products Cleo
Cleo harmony
References
Metrics cvssV2_0

{'score': 7.5, 'vector': 'AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C'}

cvssV3_0

{'score': 8.3, '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'}

cvssV3_1

{'score': 8.3, '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'}

cvssV4_0

{'score': 6.9, '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-09-01T15:00:10.144Z

Reserved: 2026-09-01T07:20:41.146Z

Link: CVE-2026-84115

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses