CVE-2026-57295Network attack vector

AWS credential capture via forged validation requests

Published Jun 24, 2026 · Updated Jun 24, 2026

CSRF in Jenkins EC2 Fleet Plugin 4.2.3.539.v8fedff2a_81c3 and earlier allows remote authenticated users to capture AWS credentials. Cloud-configuration validation endpoints accept non-POST requests and connect to attacker-selected URLs using supplied Jenkins credential IDs. Exploitation requires a credential ID obtained separately and an authenticated Jenkins context with Overall/Read access; the outbound connection exposes the stored AWS credential.

CVSS severity5.4
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in Jenkins EC2 Fleet Plugin 4.2.3.539.v8fedff2a_81c3 and earlier allows remote authenticated users to capture AWS credentials. Cloud-configuration validation endpoints accept non-POST requests and connect to attacker-selected URLs using supplied Jenkins credential IDs. Exploitation requires a credential ID obtained separately and an authenticated Jenkins context with Overall/Read access; the outbound connection exposes the stored AWS credential.

The record

CVE
CVE-2026-57295
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
Jenkins Project
Product
EC2 Fleet Plugin
Classifications
CWE-352, T1555
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=4.2.3.539.v8fedff2a_81c3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jenkins Project · EC2 Fleet Pluginversion=0 <=4.2.3.539.v8fedff2a_81c3

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1555Credentials from Password Stores

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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