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Advisory record · GHSA-9v77-j4xv-34gq

Jenkins EC2 Fleet Plugin has a missing permission check

CVSS 5.4 MediumEPSS 0.0025 · 17th percentile

Published by the GitHub Advisory Database at 24 Jun 2026, 15:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
com.amazon.jenkins.fleet:ec2-fleetMaven<4.2.3.540.va4.2.3.540.va
Identifiers
GHSA-9v77-j4xv-34gq · CVE-2026-57294
Weakness (CWE)
CWE-862
Tags
Published
24 Jun 2026
Updated
25 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The Jenkins EC2 Fleet Plugin (com.amazon.jenkins.fleet:ec2-fleet) versions 4.2.3.539 and earlier are affected. An attacker with Overall/Read permission can exploit missing permission checks in several HTTP endpoints used to validate cloud configurations to send requests to an attacker-specified URL using attacker-specified credential IDs, capturing AWS credentials stored in Jenkins. The endpoints also accept non-POST requests, which enables cross-site request forgery. Upgrade to version 4.2.3.540.va, which requires Overall/Administer permission and POST requests for these actions.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.4 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.0025, the 17th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.