CVE-2026-57283: Jenkins Pipeline Groovy Plugin CSRF Vulnerability (CVSS 4.3)

Technical summary

CVE-2026-57283 is a CSRF vulnerability (CWE-352) in Jenkins Pipeline: Groovy Plugin version 4331.v9d06ed4658ff and earlier. The vulnerability exists in the Pipeline Snippet Generator functionality, which fails to implement adequate CSRF protections when processing requests that instantiate configuration-related types. An authenticated attacker can send a forged request to instantiate types beyond the intended Pipeline steps scope, specifically targeting job or system configuration objects. The attack requires the victim to be logged into Jenkins and requires the attacker to have valid credentials, but does not require explicit user interaction (no UI click-through needed). The CVSS v3.1 score of 4.3 reflects the limited scope—integrity impact only, no confidentiality or availability loss.

Business impact

While the CVSS rating is MEDIUM, the practical business risk depends on your Jenkins deployment model. If Jenkins is used for CI/CD orchestration in regulated environments or controls critical infrastructure, unauthorized configuration changes could alter build pipelines, inject malicious artifacts, or modify deployment targets. For teams using Jenkins in less critical contexts, the risk is lower but still significant: an internal attacker or compromised account could persistently alter how jobs are configured. The requirement for authentication somewhat limits the blast radius compared to unauthenticated CSRF, but lateral movement and privilege escalation scenarios should be considered.

Affected systems

Jenkins Pipeline: Groovy Plugin version 4331.v9d06ed4658ff and all earlier versions are affected. Organizations running Jenkins instances with this plugin should identify the currently deployed version. The vulnerability affects all Jenkins installations using the affected plugin versions, regardless of OS or deployment model (on-premises, cloud, containerized). Patched or later versions of the plugin are not yet specified in the published advisory—verify against the official Jenkins security advisory for remediation guidance.

Exploitability

Exploitability is straightforward for an attacker with valid Jenkins credentials. No special technical skill is required beyond crafting HTTP requests or using a browser-based attack payload. The lack of user interaction requirement (UI:N in the CVSS vector) distinguishes this from typical clickjacking-style CSRF attacks. However, the attacker must first obtain valid login credentials, and the victim must remain logged into Jenkins during the attack window. This limits real-world exploitation to insider threats, compromised accounts, or supply-chain scenarios. No public exploit code is known to be available, and the vulnerability is not yet in the KEV catalog, but the straightforward nature of CSRF attacks means exploitation could be trivial once an attacker has credentials.

Remediation

Upgrade Jenkins Pipeline: Groovy Plugin to a patched version released after June 24, 2026. Consult the official Jenkins security advisory for the specific minimum version required. Additionally, enforce CSRF tokens and token validation across all Jenkins endpoints. Consider implementing network-level controls such as IP whitelisting for Jenkins administrative interfaces and multi-factor authentication for Jenkins user accounts to reduce the likelihood of credential compromise. Review Jenkins configuration change logs to identify any suspicious alterations made during the vulnerability exposure window.

Patch guidance

1. Access your Jenkins instance and navigate to Manage Jenkins > Plugin Manager. 2. Identify the current version of Pipeline: Groovy Plugin under the Installed Plugins list. 3. If the version is 4331.v9d06ed4658ff or earlier, a patch is available. 4. Update to the latest version (verify against the Jenkins security advisory for the exact version number). 5. Restart Jenkins to apply the plugin update. 6. Test your existing pipelines post-update to ensure no regressions. 7. Monitor Jenkins logs for any configuration anomalies during and after the update window. For organizations unable to patch immediately, disable the Pipeline Snippet Generator feature in Jenkins settings as a temporary mitigation, though this may impact developer productivity.

Detection guidance

Monitor Jenkins logs and audit trails for: - Unexpected POST requests to pipeline-related endpoints, particularly those touching the Snippet Generator functionality - Configuration changes to jobs or system settings made by users not typically involved in administrative tasks - Rapid sequences of configuration changes that do not correlate with known deployment windows - Failed authentication attempts followed by successful authenticated requests from unusual source IPs Implement Jenkins audit logging plugins to capture detailed change history. Compare configurations before and after the vulnerability exposure window to identify unauthorized modifications. Check for instantiation of non-Pipeline configuration types in build logs or configuration history.

Why prioritize this

This vulnerability warrants prompt but not emergency patching. It requires authentication and produces only integrity impacts (configuration tampering), not data breach or service disruption. However, configuration changes to CI/CD pipelines can have cascading effects on downstream systems. Prioritize patching for Jenkins instances that: (1) are accessible to multiple users or service accounts with broad permissions, (2) control critical build or deployment pipelines, (3) are in regulated environments (healthcare, finance, government), or (4) have a history of credential compromise. Non-critical Jenkins instances used for internal testing can be patched on a standard patch cycle.

Risk score, explained

The CVSS v3.1 score of 4.3 (MEDIUM severity) reflects a vulnerability with network-accessible attack vector, low attack complexity, and low privilege barrier (authenticated user required). The integrity-only impact (configuration tampering) and unchanged scope result in a moderate score. The lack of exploits in the wild and absence from the KEV catalog slightly lowers immediate risk. However, the real-world impact depends heavily on Jenkins role in your environment: a Jenkins instance controlling production deployments carries higher risk than a developer testing instance.

Frequently asked questions