CVE-2026-57294: Jenkins EC2 Fleet Plugin has a missing permission check
(updated )
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.
References
- github.com/advisories/GHSA-9v77-j4xv-34gq
- github.com/jenkinsci/ec2-fleet-plugin/commit/a6eedb7bc112de92bbba179c03840d845b845c82
- github.com/jenkinsci/ec2-fleet-plugin/pull/531
- github.com/jenkinsci/ec2-fleet-plugin/releases/tag/4.2.3.540.va_6eedb_7b_c112
- nvd.nist.gov/vuln/detail/CVE-2026-57294
- www.jenkins.io/security/advisory/2026-06-24/
Code Behaviors & Features
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