Privilege escalation in Fit2cloud Jumpserver
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (22.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Fit2cloud Jumpserver
- Jumpserver — versions < 3.10.18, >= 4.0.0, < 4.8.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/jumpserver/jumpserver/security/advisories/GHSA-5q9w-f4wh-f535 (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-27095?
- CVE-2025-27095 is a medium-severity vulnerability in Fit2cloud Jumpserver, classified under Incorrect Privilege Assignment. CVSS score: 4.3/10. Published 2025-03-31.
- How severe is CVE-2025-27095?
- Medium severity. CVSS v3 base score is 4.3 out of 10.
- Is CVE-2025-27095 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.