CVE-2025-27095: jumpserver — Exploit & Fix

Description

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 the cluster and compromise its security. This vulnerability is fixed in 4.8.0 and 3.10.18.

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CVSS v3.1 Score

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Weakness Type (CWE)

CWE-266 CWE-266

Affected Products

Vendor	Product	Versions
fit2cloud	jumpserver	< 3.10.18
fit2cloud	jumpserver	4.0.0 — 4.8.0

References

Advisories & Patches

https://github.com/jumpserver/jumpserver/security/advisories/GHSA-5q9w-f4wh-f535

Exploits

https://github.com/jumpserver/jumpserver/security/advisories/GHSA-5q9w-f4wh-f535

Frequently Asked Questions

What is CVE-2025-27095? +

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 the cluster and compromise its security. This vulnerability is fixed in 4.8.0 and 3.10.18. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2025-27095? +

CVE-2025-27095 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-27095? +

CVE-2025-27095 affects products from fit2cloud, specifically: jumpserver. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-27095? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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