CVE-2026-70444: Jenkins GitLab Plugin Disclosure Flaw

CVE-2026-70444 Overview

CVE-2026-70444 affects the Jenkins Violation Comments to GitLab Plugin version 2.62.0 and earlier. The plugin contains a missing permission check that allows authenticated attackers with Overall/Read permission to enumerate credentials IDs stored in Jenkins. The issue is tracked as SECURITY-3763 in the Jenkins security advisory dated 2026-08-05.

The flaw falls under [CWE-693] Protection Mechanism Failure. While the vulnerability does not directly expose credential values, credential ID enumeration provides reconnaissance data useful for chaining with other Jenkins vulnerabilities.

Critical Impact
Authenticated users with minimal Overall/Read permission can enumerate all credentials IDs stored in Jenkins, exposing reconnaissance data that supports credential-targeted attacks.

Affected Products

Jenkins Violation Comments to GitLab Plugin version 2.62.0
Jenkins Violation Comments to GitLab Plugin versions earlier than 2.62.0
Jenkins controllers with the affected plugin installed

Discovery Timeline

2026-08-05 - Jenkins security advisory SECURITY-3763 published
2026-08-05 - CVE-2026-70444 published to NVD
2026-08-05 - Last updated in NVD database

Technical Details for CVE-2026-70444

Vulnerability Analysis

The Jenkins Violation Comments to GitLab Plugin exposes an HTTP endpoint that returns credentials IDs from Jenkins configured credential stores. The endpoint lacks an appropriate permission check, treating Overall/Read permission as sufficient authorization to access credential metadata.

Credential IDs alone do not reveal secret material. However, attackers use enumerated IDs to target follow-on attacks against Jenkins job configuration, Groovy script consoles, or other plugin vulnerabilities that reference credentials by ID. The exposure narrows the attacker's search space during post-authentication reconnaissance.

Root Cause

The root cause is a missing authorization check on a form-related endpoint provided by the plugin. Jenkins guidance requires that endpoints returning credentials information enforce Item/Configure or equivalent permissions and verify context ownership. The affected plugin releases perform neither check, so any authenticated user with Overall/Read receives the same output that a job configurator would.

Attack Vector

Exploitation requires network access to the Jenkins web interface and a valid account holding Overall/Read permission. Overall/Read is the default baseline permission for authenticated users in many Jenkins deployments. The attacker issues a crafted HTTP request against the plugin's form-fill endpoint and parses the response to extract credential identifiers. No user interaction is required.

Refer to the Jenkins Security Advisory SECURITY-3763 for endpoint-level technical details.

Detection Methods for CVE-2026-70444

Indicators of Compromise

HTTP requests from low-privileged Jenkins accounts to Violation Comments to GitLab Plugin form-fill or doFill* endpoints
Unexpected access patterns where users with only Overall/Read permission query credentials-related plugin URLs
Sequential or scripted requests against /descriptorByName/ endpoints belonging to the affected plugin

Detection Strategies

Review Jenkins access logs for requests to plugin endpoints returning credential metadata, correlating source user with assigned permissions.
Alert on anomalous request volume from accounts that do not manage jobs or credentials.
Baseline normal plugin endpoint usage per user role and flag deviations.

Monitoring Recommendations

Forward Jenkins controller access logs and audit logs to a centralized logging platform for retention and correlation.
Monitor for the specific plugin descriptor paths in HTTP request URIs.
Track credential usage events and correlate with recent enumeration attempts against the same credential IDs.

How to Mitigate CVE-2026-70444

Immediate Actions Required

Inventory Jenkins controllers to identify installations running Violation Comments to GitLab Plugin 2.62.0 or earlier.
Update the plugin to a fixed release once available per the Jenkins Security Advisory.
Audit Jenkins user accounts and remove Overall/Read from users who do not require it.
Rotate any credentials whose IDs may inform targeted attacks, particularly those referenced in publicly accessible jobs.

Patch Information

Consult the Jenkins Security Advisory SECURITY-3763 for the fixed plugin version and upgrade instructions. Apply plugin updates through the Jenkins Update Center or by installing the updated .hpi file on the controller.

Workarounds

Disable the Violation Comments to GitLab Plugin on affected controllers until a fix is applied.
Restrict anonymous and authenticated user permissions so that Overall/Read is not granted broadly through matrix-based or project-based authorization strategies.
Place Jenkins behind an authenticated reverse proxy that restricts access to trusted networks.

bash

# Example: list installed plugin version via Jenkins CLI
java -jar jenkins-cli.jar -s https://jenkins.example.com/ \
  list-plugins | grep violation-comments-to-gitlab