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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-57294US | — | — | ||
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 us… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/jenkinsci/ec2-fleet-pluginPACKAGE
- https://github.com/jenkinsci/ec2-fleet-plugin/commit/a6eedb7bc112de92bbba179c03840d845b845c82WEB
- https://github.com/jenkinsci/ec2-fleet-plugin/pull/531WEB
- https://github.com/jenkinsci/ec2-fleet-plugin/releases/tag/4.2.3.540.va_6eedb_7b_c112WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-57294ADVISORY
- https://www.jenkins.io/security/advisory/2026-06-24/#SECURITY-3774WEB
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