CVE-2026-84115 Cleo Harmony JWT Refresh Token connections privileges management
Remote attackers can escalate privileges by manipulating JWT refresh tokens in Cleo Harmony, requiring an upgrade to remediate.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84115?
CVE-2026-84115 is a medium-severity vulnerability in Cleo Harmony, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-84115?
How do I fix CVE-2026-84115?
No fix has been published for CVE-2026-84115 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-84115 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-84115 exists.
Sources
Also known as GHSA-jg45-wrwh-x4rp.