CVE-2023-28110: FIT2CLOUD Jumpserver

Critical severity, CVSS 9.9. EPSS: 0.8% chance of exploitation in the next 30 days.

Jumpserver is a popular open source bastion host, and Koko is a Jumpserver component that is the Go version of coco, refactoring coco's SSH/SFTP service and Web Terminal service. Prior to version 2.28.8, using illegal tokens to connect to a Kubernetes cluster through Koko can result in the execution of dangerous commands that may disrupt the Koko container environment and affect normal usage. The vulnerability has been fixed in v2.28.8.

Affected products

• FIT2CLOUD Jumpserver: before 2.28.8 (fixed in 2.28.8)
• FIT2CLOUD Koko: affected versions not specified

Published 2023-03-16. Last modified 2026-06-17.