High severity · published Sep 1, 2026
CVE-2026-84115
Cleo Harmony JWT Refresh Token connections privileges management
8.3
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HA
Harmony · Cleo
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 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-84115
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-84115
support.cleo.com
https://support.cleo.com/hc/en-us/articles/30258468834583-Cleo-Harmony-5-8-1-Release-Notes#Version58111
vuldb.com
https://vuldb.com/cve/CVE-2026-84115
vuldb.com
https://vuldb.com/submit/882468
vuldb.com
https://vuldb.com/vuln/397558
vuldb.com
https://vuldb.com/vuln/397558/cti
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