Cleo vulnerabilities
We track 4 vulnerabilities in Cleo products across 4 products. 4 are rated high or critical, and 2 have been exploited in real attacks. The most recent was published on September 1, 2026.
Latest Cleo vulnerabilities
- 8.3 High severity
Harmony: Incorrect Privilege Assignment
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 manage
- 9.8 Critical severity
Cleo Multiple Products Unauthenticated File Upload Exploited
In Cleo Harmony before 5.8.0.24, VLTrader before 5.8.0.24, and LexiCom before 5.8.0.24, an unauthenticated user can import and execute arbitrary Bash or PowerShell commands on the host system by leveraging the default settings of the Autorun directory.
- 9.8 Critical severity
Cleo Multiple Products Unrestricted File Upload Exploited
In Cleo Harmony before 5.8.0.21, VLTrader before 5.8.0.21, and LexiCom before 5.8.0.21, there is an unrestricted file upload and download that could lead to remote code execution.
- 7.5 High severity
cleo: Inefficient Regular Expression Complexity
An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the cleo PyPI package, when an attacker is able to supply arbitrary input to the Table.set_rows method