CVE-2025-27095: JumpServer is an open source bastion host and an operation and maintenance security audit system

Routine

MEDIUM 4.3UPGRADE

CVE-2025-27095 is a medium-severity flaw (CVSS 4.3) affecting jumpserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

JumpServer is an open source bastion host and an operation and maintenance security audit system. Prior to 4.8.0 and 3.10.18, an attacker with a low-privileged account can access the Kubernetes session feature and manipulate the kubeconfig file to redirect API requests to an external server controlled by the attacker. This allows the attacker to intercept and capture the Kubernetes cluster token. This can potentially allow unauthorized access to

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-266
Published	2025-03-31
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

2025-03-31 16:15 UTCPublished CVE record published
2026-06-17 09:03 UTCUpdated Record last modified

fit2cloud jumpserver UPGRADE

Affected: < 3.10.18 · >= 4.0.0 and < 4.8.0

Fixed in: 3.10.18, 4.8.0

Safe to downgrade to: a release before 4.0.0

1. Check installed version

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

2. UPGRADE to 3.10.18 (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.

3. If no update is available yet, DOWNGRADE to a release before 4.0.0 (Debian / Ubuntu)

apt-cache madison jumpserver sudo apt install jumpserver=<VERSION_BEFORE_4.0.0> sudo apt-mark hold jumpserver

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jumpserver sudo dnf downgrade jumpserver-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add jumpserver

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2025-27095?

jumpserver: upgrade to 3.10.18, 4.8.0. Exact commands for each OS are on this page.

Is CVE-2025-27095 being exploited?

CVE-2025-27095 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-2025-27095 affect?

CVE-2025-27095 affects jumpserver. Severity is medium (CVSS 4.3). JumpServer is an open source bastion host and an operation and maintenance security audit system. Prior to 4.8.0 and 3.10.18, an attacker with a low-privileged account can access the Kubernetes session feature and manipulate the kubeconfig

How urgent is CVE-2025-27095?

Priority 27/100. Public exploit reference

Software pages

Kubernetes vulnerabilities

Related CVEs

CVE-2025-62712 CRITICAL 9.6 UPGRADE JumpServer is an open source bastion host and an operation and maintenance security audit system
CVE-2025-62795 HIGH 7.1 UPGRADE JumpServer is an open source bastion host and an operation and maintenance security audit system
CVE-2023-48193 CRITICAL 9.8 DOWNGRADE Insecure Permissions vulnerability in JumpServer GPLv3 v.3.8.0 allows a remote attacker to execute arbitrary c
CVE-2026-31864 MEDIUM 6.8 UPGRADE JumpServer is an open source bastion host and an operation and maintenance security audit system
CVE-2026-31798 MEDIUM 5.0 UPGRADE JumpServer is an open source bastion host and an operation and maintenance security audit system

References

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