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MEDIUM severity

CVE-2026-57295 — Ec2 Fleet

MEDIUM

CVE-2026-57295 is a medium-severity (CVSS 5.4) Cross-Site Request Forgery (CSRF) vulnerability in jenkins ec2 fleet. No vendor fix is recorded yet; mitigation options are listed below.

A cross-site request forgery (CSRF) vulnerability in Jenkins EC2 Fleet Plugin 4.2.3.539.v8fedff2a_81c3 and earlier allows attackers to connect to an attacker-specified URL using attacker-specified…

Published
Updated
Affected
1 product
Patched
See advisory
Exploits
None indexed
Exploitation data as of Oct 22, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-57295.

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs12th percentile — riskier than 12% of all scored CVEsHighest risk
0.00%0.24%0.48%0.72%0.1%0.1%0.2%0.2%0.2%Jul 26Sep 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-57295 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 394,415 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Description

A cross-site request forgery (CSRF) vulnerability in Jenkins EC2 Fleet Plugin 4.2.3.539.v8fedff2a_81c3 and earlier allows attackers to connect to an attacker-specified URL using attacker-specified credentials IDs obtained through another method, capturing AWS credentials stored in Jenkins.

Affected Products

1 product · 1 configurations
Application
ec2 fleetjenkins
≤ 4.2.3.539.v8fedff2a_81c3
range

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every jenkins ec2 fleet deployment and check each version against the affected-products list above.

  2. Remediation status

    No patch has shipped for CVE-2026-57295 yet — track the jenkins ec2 fleet advisory for a fixed release and apply the workarounds below in the meantime.

  3. Mitigate without a patch

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

A cross-site request forgery (CSRF) vulnerability in Jenkins EC2 Fleet Plugin 4.2.3.539.v8fedff2a_81c3 and earlier allows attackers to connect to an attacker-specified URL using attacker-specified credentials IDs obtained through another method, capturing AWS credentials stored in Jenkins.
O3 Security · Runtime Protection

Is CVE-2026-57295 being exploited in your environment?

Detect and block the exploit chain at execution, on systems you cannot patch yet.

Protect my workloads How runtime protection works
CVE-2026-57295: Ec2 Fleet CSRF (Medium 5.4)