CVE-2026-57307: Jenkins Zowe Plugin Auth Bypass Flaw

CVE-2026-57307 Overview

CVE-2026-57307 is a missing permission check vulnerability in the Jenkins Zowe zDevOps Plugin version 1.1.3.50.ve350c9b_450b_1 and earlier. The flaw allows attackers with Overall/Read permission to connect to an attacker-specified URL using attacker-specified credentials IDs. This enables capture of credentials stored in Jenkins when the credentials IDs are obtained through another method. The vulnerability is categorized under [CWE-862] Missing Authorization.

Critical Impact
Authenticated attackers with minimal Jenkins permissions can exfiltrate stored credentials by redirecting plugin connection attempts to attacker-controlled infrastructure.

Affected Products

Jenkins Zowe zDevOps Plugin versions 1.1.3.50.ve350c9b_450b_1 and earlier
Jenkins instances with the Zowe zDevOps Plugin installed
Jenkins environments granting Overall/Read permission to untrusted users

Discovery Timeline

2026-06-24 - Jenkins Security Advisory published (SECURITY-3747)
2026-06-24 - CVE-2026-57307 published to NVD
2026-06-25 - Last updated in NVD database

Technical Details for CVE-2026-57307

Vulnerability Analysis

The Jenkins Zowe zDevOps Plugin exposes a connection-testing or configuration endpoint that accepts a target URL and a credentials ID as parameters. The plugin retrieves the referenced credentials from the Jenkins credentials store and submits them to the supplied URL. The vulnerable versions do not verify that the requesting user holds the permission level required to perform credential operations.

Attackers holding only Overall/Read permission can invoke this endpoint. By specifying a URL pointing to an attacker-controlled server, they receive the plaintext credentials in the resulting outbound request. The captured material may include service account passwords, API tokens, or mainframe credentials used by zDevOps pipelines.

Exploitation requires the attacker to already know a valid credentials ID. Credentials IDs are not treated as secrets by Jenkins and can frequently be discovered through configuration views, job logs, or other plugin vulnerabilities. The result is information disclosure rather than direct code execution.

Root Cause

The root cause is missing authorization enforcement on a plugin form-submission or connection-validation endpoint. The handler should require a higher permission such as Item/Configure or Overall/Administer before allowing arbitrary URL and credential combinations. The omission falls under [CWE-862] Missing Authorization.

Attack Vector

The attack vector is network-based and requires low-privilege authentication. An attacker with Overall/Read access sends a crafted HTTP request to the vulnerable plugin endpoint, supplying a URL under their control and a known credentials ID. The Jenkins controller then transmits the resolved credentials to that URL.

The vulnerability is described in prose only because no public proof-of-concept code is referenced in the advisory. Technical specifics are available in the Jenkins Security Advisory #2026-06-24.

Detection Methods for CVE-2026-57307

Indicators of Compromise

Outbound HTTP or HTTPS connections from the Jenkins controller to unexpected external hosts originating from the Zowe zDevOps Plugin.
Jenkins audit log entries showing form submissions to Zowe zDevOps plugin endpoints by users holding only Overall/Read permission.
Anomalous use of stored credentials shortly after suspicious plugin endpoint requests.

Detection Strategies

Review Jenkins access logs for requests to Zowe zDevOps plugin URLs containing credentialsId and target URL parameters issued by low-privilege accounts.
Correlate outbound network connections from the Jenkins controller against an allowlist of expected zDevOps endpoints.
Monitor for credential usage from unfamiliar source addresses immediately following plugin endpoint activity.

Monitoring Recommendations

Forward Jenkins controller access and audit logs to a centralized analytics platform for retention and correlation.
Alert on any outbound connection from the Jenkins controller to non-corporate destinations.
Track the distribution of permissions in Jenkins and review accounts that hold Overall/Read but no business need for plugin interaction.

How to Mitigate CVE-2026-57307

Immediate Actions Required

Upgrade the Jenkins Zowe zDevOps Plugin to a fixed release once published by the maintainers per the Jenkins Security Advisory #2026-06-24.
Rotate all credentials stored in Jenkins that the Zowe zDevOps Plugin can access, particularly mainframe and z/OS service accounts.
Restrict Overall/Read permission to trusted users and review external authentication integrations granting this permission by default.

Patch Information

Review the Jenkins Security Advisory #2026-06-24 for the fixed plugin version and upgrade guidance. Versions later than 1.1.3.50.ve350c9b_450b_1 should be evaluated for the corrected authorization check.

Workarounds

Disable or uninstall the Zowe zDevOps Plugin if it is not actively required for build pipelines.
Apply network egress filtering on the Jenkins controller to permit only known zDevOps and Zowe API destinations.
Tighten Jenkins authorization so that anonymous and low-trust authenticated users do not receive Overall/Read permission.

bash

# Configuration example: list installed Jenkins plugins and versions via CLI
java -jar jenkins-cli.jar -s https://jenkins.example.com/ \
  -auth admin:API_TOKEN \
  list-plugins | grep -i zdevops