GHSA-9v77-j4xv-34gq
Jenkins EC2 Fleet Plugin has a missing permission check
Quick fix
GHSA-9v77-j4xv-34gq — com.amazon.jenkins.fleet:ec2-fleet: upgrade to the fixed version with the command below.
# pom.xml: bump <version>4.2.3.540.va</version> for com.amazon.jenkins.fleet:ec2-fleetDetails
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.
Are you affected?
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Affected packages
0Fixed in: 4.2.3.540.va# pom.xml: bump <version>4.2.3.540.va</version> for com.amazon.jenkins.fleet:ec2-fleetReferences
- https://nvd.nist.gov/vuln/detail/CVE-2026-57294[ADVISORY]
- https://github.com/jenkinsci/ec2-fleet-plugin/pull/531[WEB]
- https://github.com/jenkinsci/ec2-fleet-plugin/commit/a6eedb7bc112de92bbba179c03840d845b845c82[WEB]
- https://github.com/jenkinsci/ec2-fleet-plugin[PACKAGE]
- https://github.com/jenkinsci/ec2-fleet-plugin/releases/tag/4.2.3.540.va_6eedb_7b_c112[WEB]
- https://www.jenkins.io/security/advisory/2026-06-24/#SECURITY-3774[WEB]