# 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.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 Jun 2026
- **Updated:** 24 Jun 2026
- **Also known as:** GHSA-9v77-j4xv-34gq

## 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 (Missing Authorization)

## 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 | Ecosystem | 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: 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.

## 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

- [CVE-2026-57295](https://insights.sbomify.com/CVE-2026-57295/): Jenkins EC2 Fleet Plugin has a cross-site request forgery (CSRF) vulnerability (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-57294 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-57294 in the wild and no public exploit code.

Affected packages and fixed versions:
- com.amazon.jenkins.fleet:ec2-fleet (Maven): affected all versions; fixed in 4.2.3.540.va
- com.amazon.jenkins.fleet:ec2-fleet (Maven): affected all versions; fixed in 4.2.3.540.va

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-57294/ (Markdown: https://insights.sbomify.com/CVE-2026-57294/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-57294
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-57294
- OSV: https://osv.dev/vulnerability/CVE-2026-57294

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-57294/
Summaries are generated and may contain mistakes; the official description above is the record.