CVE-2026-84115

HIGH 8.3

Cleo Harmony JWT Refresh Token connections privileges management

CVSS Score

8.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-269 CWE-266
Vendor	cleo
Product	harmony
Published	Sep 1, 2026
Last Updated	Sep 1, 2026

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CVSS v3 Breakdown

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

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

Cleo / Harmony

5.8.1.0 5.8.1.1 5.8.1.2 5.8.1.3 5.8.1.4 5.8.1.5 5.8.1.6 5.8.1.7 5.8.1.8 5.8.1.9 5.8.1.10

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 ilyass-armadin (VulDB User)