CVE-2026-57294

Medium

Description

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 using attacker-specified credentials IDs obtained through another method, capturing AWS credentials stored in Jenkins.

SeverityMedium

CVSS5.4

Exploit probability—

Product

Jenkins Ec2 Fleet

PublishedJun 24, 2026

First seenJun 24, 2026

Weakness typeCWE-862Missing authorization

How to fix

Update

com.amazon.jenkins.fleet:ec2-fleet4.2.3.540.va or later

Vendor advisories

jenkins.io/security/advisory/2026-06-24/#SECURITY-3774

Affected products

Product	Affected versions	Fixed in
jenkins ec2_fleet	v ≤ 4.2.3.539.v8fedff2a_81c3	—
com.amazon.jenkins.fleet:ec2-fleetMaven	v < 4.2.3.540.va	4.2.3.540.va

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