CVE-2023-28110: Jumpserver is a popular open source bastion host, and Koko is a Jumpserver component that is the Go version of

Q: How do I fix CVE-2023-28110?

jumpserver: upgrade to 2.28.8; koko: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2023-28110 being exploited?

CVE-2023-28110 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-28110 affect?

CVE-2023-28110 affects jumpserver, koko. Severity is medium (CVSS 5.7). 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

Q: How urgent is CVE-2023-28110?

Priority 39/100. Public exploit reference

Routine

MEDIUM 5.7UPGRADEMITIGATE

CVE-2023-28110 is a medium-severity flaw (CVSS 5.7) affecting jumpserver, koko. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.7 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.8% (top 42%)
CISA exploited list	No
Weakness	CWE-77
Published	2023-03-16
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: fit2cloud

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-03-16 17:15 UTCPublished CVE record published
2026-06-17 05:46 UTCUpdated Record last modified

fit2cloud jumpserver UPGRADE

Affected: < 2.28.8

Fixed in: 2.28.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy jumpserver || rpm -q jumpserver || jumpserver --version

2. UPGRADE to 2.28.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jumpserver

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jumpserver

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

fit2cloud koko MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy koko || rpm -q koko || koko --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-28110?

jumpserver: upgrade to 2.28.8; koko: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-28110 being exploited?

CVE-2023-28110 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-28110 affect?

CVE-2023-28110 affects jumpserver, koko. Severity is medium (CVSS 5.7). 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

How urgent is CVE-2023-28110?

Priority 39/100. Public exploit reference

Software pages

Kubernetes vulnerabilities

Related CVEs

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CVE-2026-31864 MEDIUM 6.8 UPGRADE JumpServer is an open source bastion host and an operation and maintenance security audit system
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References

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