Vulnerability · Published Jun 24, 2026 · Assigned by jenkins

CVE-2026-57294

Medium 5.4

In plain English

A medium-severity missing authorization in Jenkins EC2 Fleet Plugin from Jenkins Project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.3%top 82.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Maven	com.amazon.jenkins.fleet:ec2-fleet	4.2.3.540.va	GHSA-9v77-j4xv-34gq

Affected products (as reported)

Vendor	Product	Versions
Jenkins Project	Jenkins EC2 Fleet Plugin	0 – through 4.2.3.539.v8fedff2a_81c3

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

References

Jenkins Security Advisory 2026-06-24 vendor-advisory