CVE-2026-57295: Jenkins EC2 Fleet

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

A cross-site request forgery (CSRF) vulnerability in Jenkins EC2 Fleet Plugin 4.2.3.539.v8fedff2a_81c3 and earlier allows attackers to connect to an attacker-specified URL using attacker-specified credentials IDs obtained through another method, capturing AWS credentials stored in Jenkins.

Affected products

• Jenkins EC2 Fleet: up to and including 4.2.3.539.v8fedff2a_81c3

Published 2026-06-24. Last modified 2026-06-26.