CVE-2026-57294: ec2 fleet Auth Bypass — Fix

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.

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CVSS v3.1 Score

5.4

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0016

Probability of exploitation

0.06%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-862 Missing Authorization

Affected Products

Vendor	Product	Versions
jenkins	ec2_fleet	< 4.2.3.539.v8fedff2a_81c3

References

Advisories & Patches

https://www.jenkins.io/security/advisory/2026-06-24/#SECURITY-3774

Frequently Asked Questions

What is CVE-2026-57294? +

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. It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2026-57294? +

CVE-2026-57294 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0016, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-57294? +

CVE-2026-57294 affects products from jenkins, specifically: ec2_fleet. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-57294? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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