Jenkins EC2 Fleet Plugin has a missing permission check
Jenkins EC2 Fleet Plugin 4.2.3.539.v8fedff2a_81c3 and earlier does not perform permission checks in several HTTP endpoints used to validate cloud configurations.
This 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.
Additionally, these HTTP endpoints do not require POST requests, resulting in a cross-site request forgery (CSRF) vulnerability.
EC2 Fleet Plugin 4.2.3.540.va_6eedb_7b_c112 requires Overall/Administer permission and POST requests to perform these form validation actions.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | com.amazon.jenkins.fleet:ec2-fleet | < 4.2.3.540.va | 4.2.3.540.va |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-57294
- https://github.com/jenkinsci/ec2-fleet-plugin/pull/531
- https://github.com/jenkinsci/ec2-fleet-plugin/commit/a6eedb7bc112de92bbba179c03840d845b845c82
- https://github.com/jenkinsci/ec2-fleet-plugin
- https://github.com/jenkinsci/ec2-fleet-plugin/releases/tag/4.2.3.540.va_6eedb_7b_c112
- https://www.jenkins.io/security/advisory/2026-06-24/#SECURITY-3774
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N- Weakness (CWE)
CWE-862- Platform
- Java / Kotlin (Maven)
- Package
com.amazon.jenkins.fleet:ec2-fleet- Disclosed
- 24.06.2026
- Updated
- 11.10.2026 13:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-9v77-j4xv-34gq - CC BY 4.0
Vulnerability history: com.amazon.jenkins.fleet:ec2-fleet
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 06.2026 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 2
Disclosures per year
- 2026: 2
-
Jenkins EC2 Fleet Plugin has a missing permission check this entry
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