Answer in brief
CVE-2026-57294 records a Medium severity (CVSS 5.4) vulnerability in Jenkins EC2 Fleet Plugin has a missing permission check. The current sources do not mark it as known exploited. The current feed maps com.amazon.jenkins.fleet:ec2-fleet (maven), com.amazon.jenkins.fleet:ec2-fleet (maven). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps com.amazon.jenkins.fleet:ec2-fleet (maven), com.amazon.jenkins.fleet:ec2-fleet (maven). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| com.amazon.jenkins.fleet:ec2-fleetmaven | <4.2.3.540.va | 4.2.3.540.va |
| com.amazon.jenkins.fleet:ec2-fleetmaven | >=0 <4.2.3.540.va | 4.2.3.540.va |
Published upstream
Jun 24, 2026
Evidence: source:ghsa:source_dates:source-dates:recordSource modified
Sep 25, 2026
Evidence: source:ghsa:source_dates:source-dates:recordFirst seen by HOL
Jun 24, 2026
Jenkins EC2 Fleet Plugin 4.2.3.539.v8fedff2a_81c3 and earlier does not perform permission checks in several HTTP endpoints used to validate cloud configurations. This 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. Additionally, these HTTP endpoints do not require POST requests, resulting in a cross-site request forgery (CSRF) vulnerability. EC2 Fleet Plugin 4.2.3.540.va_6eedb_7b_c112 requires Overall/Administer permission and POST requests to perform these form validation actions.
Quoted source text, attributed separately from HOL analysis.