CVE-2026-57294: A missing permission check in Jenkins EC2 Fleet Plugin 4.2.3.539.v8fedff2a_81c3 and earlier allows attackers w

Q: How do I fix CVE-2026-57294?

ec2 fleet: upgrade to newer than 4.2.3.539.v8fedff2a_81c3. Exact commands for each OS are on this page.

Q: Is CVE-2026-57294 being exploited?

CVE-2026-57294 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-57294 affect?

CVE-2026-57294 affects ec2 fleet. Severity is medium (CVSS 5.4). 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 anot

Q: How urgent is CVE-2026-57294?

Priority 23/100. No elevated risk signals yet.

Routine

MEDIUM 5.4UPGRADE

CVE-2026-57294 is a medium-severity flaw (CVSS 5.4) affecting ec2 fleet. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-06-24
Last modified	2026-10-25

Publisher (CNA): Jenkins Project · Vendor: jenkins

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-24 14:17 UTCPublished CVE record published
2026-10-25 22:10 UTCUpdated Record last modified

jenkins ec2 fleet UPGRADE

Affected: <= 4.2.3.539.v8fedff2a_81c3

Fixed in: newer than 4.2.3.539.v8fedff2a_81c3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ec2-fleet || rpm -q ec2-fleet || ec2-fleet --version

2. UPGRADE to newer than 4.2.3.539.v8fedff2a_81c3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ec2-fleet

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ec2-fleet

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-57294?

ec2 fleet: upgrade to newer than 4.2.3.539.v8fedff2a_81c3. Exact commands for each OS are on this page.

Is CVE-2026-57294 being exploited?

CVE-2026-57294 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-57294 affect?

CVE-2026-57294 affects ec2 fleet. Severity is medium (CVSS 5.4). 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 anot

How urgent is CVE-2026-57294?

Priority 23/100. No elevated risk signals yet.

Software pages

Jenkins vulnerabilities · AWS vulnerabilities

Related CVEs

CVE-2026-57295 MEDIUM 5.4 UPGRADE A cross-site request forgery (CSRF) vulnerability in Jenkins EC2 Fleet Plugin 4.2.3.539.v8fedff2a_81c3 and ear

References

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