CVE-2026-57294 Jenkins EC2 Fleet Plugin has a missing permission check
Attackers with read permissions can capture AWS credentials by connecting to a malicious URL due to missing permission checks in the Jenkins EC2 Fleet Plugin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-57294?
CVE-2026-57294 is a medium-severity missing authorization vulnerability in Jenkins EC2 Fleet Plugin, published on 24 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-862
Which versions are affected by CVE-2026-57294?
2 open source packages ship an affected version, including com.amazon.jenkins.fleet:ec2-fleet. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
com.amazon.jenkins.fleet:ec2-fleet Maven | All versions | 4.2.3.540.va |
com.amazon.jenkins.fleet:ec2-fleet Maven | All versions | 4.2.3.540.va |
Products include Jenkins Ec2 Fleet.
How do I fix CVE-2026-57294?
Upgrade com.amazon.jenkins.fleet:ec2-fleet to 4.2.3.540.va or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-57294 being exploited?
There is no known exploitation of CVE-2026-57294 in the wild and no public exploit code.
Other vulnerabilities in Jenkins EC2 Fleet Plugin
Sources
Also known as GHSA-9v77-j4xv-34gq.