CVE-2026-84115
Cleo Harmony JWT Refresh Token connections privileges management
- State
- Published
- Severity
- 6.9 Medium
- Published
- Sep 1, 2026
- Updated
- Sep 1, 2026
- Reserved
- Sep 1, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | 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 | VulDB |
| 3.1 | 8.3 High | 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 | VulDB |
| 3.0 | 8.3 High | 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 | VulDB |
| 2.0 | 7.5 High | AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C | VulDB |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
HarmonyCleo |
|
References
- VDB-397558 | Cleo Harmony JWT Refresh Token connections privileges managementvdb-entrytechnical-description
- VDB-397558 | CTI Indicators (IOB, IOC, TTP, IOA)signaturepermissions-required
- CVE-2026-84115 | CVE Analysis and Reportthird-party-advisory
- Submit #882468 | Cleo Harmony < 5.8.1.11 Privilege Escalation via Cross-Store Identity Lookup Confusionthird-party-advisory
- https://support.cleo.com/hc/en-us/articles/30258468834583-Cleo-Harmony-5-8-1-Release-Notes#Version58111broken-linkpatch
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