---
id: CVE-2026-57294
aliases:
  - GHSA-9v77-j4xv-34gq
title: Jenkins EC2 Fleet Plugin has a missing permission check
summary: Jenkins EC2 Fleet Plugin has a missing permission check
severity: medium
cvss: 5.4
cwe:
  - CWE-862
vendor: amazon
product: 'com.amazon.jenkins.fleet:ec2-fleet'
ecosystem: maven
affected:
  - 'com.amazon.jenkins.fleet:ec2-fleet < 4.2.3.540.va'
patched:
  - 'com.amazon.jenkins.fleet:ec2-fleet 4.2.3.540.va'
published: '2026-06-24'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T19:03:01Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-9v77-j4xv-34gq'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-57294'
  - url: 'https://www.jenkins.io/security/advisory/2026-06-24/#SECURITY-3774'
  - url: 'https://github.com/jenkinsci/ec2-fleet-plugin/pull/531'
  - url: >-
      https://github.com/jenkinsci/ec2-fleet-plugin/commit/a6eedb7bc112de92bbba179c03840d845b845c82
  - url: >-
      https://github.com/jenkinsci/ec2-fleet-plugin/releases/tag/4.2.3.540.va_6eedb_7b_c112
  - url: 'https://github.com/advisories/GHSA-9v77-j4xv-34gq'
tags:
  - ghsa
  - maven
epss: 0.00254
epssPercentile: 0.15131
ingestedAt: '2026-09-25T19:15:38.960Z'
---

## Overview

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.

## Affected packages

- `com.amazon.jenkins.fleet:ec2-fleet < 4.2.3.540.va`

## Remediation

Upgrade to a patched release:

- `com.amazon.jenkins.fleet:ec2-fleet 4.2.3.540.va`