Auth bypass in Jenkins Ec2 Fleet
CVE-2026-57294
A missing permission check in Jenkins EC2 Fleet Plugin 4.2.3.539.v8fedff2a_81c3 and earlier allows attackers with Overall/Read permission to connect to an attacker-specified URL using attacker-specified credentials IDs obtained through another method, capturing AWS credentials stored in Jenkins.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (15.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.3% 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
- Jenkins Ec2 Fleet
- Jenkins Project Ec2 Fleet Plugin — versions 0
Weakness classification (CWE)
References
- www.jenkins.io/security/advisory/2026-06-24/ (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-57294?
- CVE-2026-57294 is a medium-severity vulnerability in Jenkins Ec2 Fleet, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-06-24.
- How severe is CVE-2026-57294?
- Medium severity. CVSS v3 base score is 5.4 out of 10.