What’s Vulnerable › Vulnerabilities

CVE-2026-84115: Cleo Harmony JWT Refresh Token connections privileges management

• Severity: high (CVSS 8.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-01 · updated 2026-09-01
• Weakness: CWE-266

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.

Affected products

• 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)

References

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

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