CVE-2026-33004: Jenkins LoadNinja Information Disclosure

CVE-2026-33004 Overview

Jenkins LoadNinja Plugin 2.1 and earlier contains an information disclosure vulnerability that fails to mask LoadNinja API keys displayed on the job configuration form. This security flaw increases the potential for attackers to observe and capture sensitive API credentials, potentially leading to unauthorized access to LoadNinja services and associated resources.

Critical Impact
Exposed API keys could allow attackers to gain unauthorized access to LoadNinja load testing services, potentially compromising test data, infrastructure credentials, and enabling further attacks against connected systems.

Affected Products

Jenkins LoadNinja Plugin version 2.1 and earlier

Discovery Timeline

2026-03-18 - CVE CVE-2026-33004 published to NVD
2026-03-19 - Last updated in NVD database

Technical Details for CVE-2026-33004

Vulnerability Analysis

This vulnerability is classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). The Jenkins LoadNinja Plugin fails to implement proper credential masking for API keys when displayed in the job configuration form interface. In secure credential management practices, sensitive values such as API keys should be masked (displayed as asterisks or dots) to prevent visual exposure to unauthorized viewers who may have access to the configuration interface.

The attack requires network access and low-privilege authenticated access to the Jenkins instance. While the vulnerability does not directly enable system compromise, credential exposure can serve as a stepping stone for more significant attacks against LoadNinja services and any systems that share the same credentials.

Root Cause

The root cause stems from improper handling of sensitive credential display in the plugin's job configuration form. The LoadNinja API key field was implemented without the appropriate masking attribute that would hide the actual key value from visual inspection. This oversight allows any user with access to view job configurations to see the plaintext API key, violating the principle of least privilege and secure credential handling.

Attack Vector

The attack vector operates through the network, requiring an authenticated user with at least low-level privileges to access the Jenkins job configuration page. An attacker with valid Jenkins credentials could navigate to jobs using the LoadNinja plugin and observe the unmasked API keys directly in the configuration form. This exposure could occur through:

Direct visual observation by malicious insiders
Screen sharing or recording during configuration reviews
Shoulder surfing in shared workspace environments
Cached browser data or session replay attacks

The vulnerability enables passive credential harvesting without requiring active exploitation techniques.

Detection Methods for CVE-2026-33004

Indicators of Compromise

Unusual access patterns to Jenkins job configuration pages, particularly for jobs utilizing the LoadNinja plugin
Unexpected API activity on LoadNinja services that doesn't correlate with legitimate testing schedules
Authentication logs showing access to job configurations by users who don't typically modify those jobs
Reports of unauthorized LoadNinja service usage or billing anomalies

Detection Strategies

Monitor Jenkins audit logs for access to job configuration pages containing LoadNinja plugin configurations
Implement session recording or activity monitoring for administrative Jenkins interfaces
Review LoadNinja API usage logs for activity from unexpected IP addresses or unusual patterns
Deploy browser security policies to prevent unauthorized screen capture or session recording

Monitoring Recommendations

Enable comprehensive audit logging in Jenkins to track all configuration access events
Configure alerts for unusual job configuration viewing patterns, especially for jobs with sensitive integrations
Implement LoadNinja API access monitoring to detect unauthorized credential usage
Regularly review Jenkins access control lists to ensure only authorized personnel can view sensitive configurations

How to Mitigate CVE-2026-33004

Immediate Actions Required

Update Jenkins LoadNinja Plugin to a version newer than 2.1 that includes the security fix
Rotate all LoadNinja API keys that may have been exposed through the vulnerable plugin configuration
Review Jenkins audit logs to identify users who may have viewed the unmasked credentials
Verify that updated LoadNinja API keys are properly masked in the configuration interface after patching

Patch Information

Jenkins has released a security advisory addressing this vulnerability. Refer to the Jenkins Security Advisory SECURITY-3642 for official patch information and updated plugin versions. Administrators should update the LoadNinja Plugin through the Jenkins Plugin Manager to obtain the latest security fixes.

Workarounds

Restrict access to Jenkins job configurations using role-based access control (RBAC) to limit who can view sensitive plugin settings
Consider using Jenkins Credentials Plugin to store API keys separately and reference them by ID rather than embedding directly in job configurations
Implement network segmentation to limit access to Jenkins configuration interfaces
Enable mandatory multi-factor authentication for Jenkins administrative access to reduce unauthorized viewing risk

bash

# Configuration example - Restrict job configuration access via Jenkins Script Console
# This Groovy script restricts who can configure jobs with LoadNinja plugin
import jenkins.model.*
import hudson.security.*

def instance = Jenkins.getInstance()
def strategy = instance.getAuthorizationStrategy()

// Audit current permissions for Job/Configure
println "Review and restrict Job/Configure permissions for sensitive jobs"
println "Navigate to: Manage Jenkins > Configure Global Security > Authorization"
println "Ensure only trusted administrators have Job/Configure permissions"