CVE-2025-64132 identifies a security vulnerability in the Jenkins MCP Server Plugin, specifically versions 0.84.v50ca_24ef83f2 and earlier. The root cause is the lack of proper permission checks within multiple MCP tools embedded in the plugin. This security flaw allows attackers who have some level of privileges on the Jenkins server to bypass intended access controls. Consequently, they can trigger builds without authorization and retrieve sensitive information about job configurations and cloud infrastructure details that should be restricted. The vulnerability is classified under CWE-862 (Missing Authorization), indicating a failure to enforce proper access control. The CVSS v3.1 base score is 5.4, with an attack vector of network (AV:N), low attack complexity (AC:L), requiring privileges (PR:L), no user interaction (UI:N), unchanged scope (S:U), and impacts on confidentiality and integrity (C:L/I:L), but no impact on availability (A:N). No patches or exploits are currently publicly available, but the vulnerability's presence in a widely used CI/CD tool like Jenkins makes it a significant concern. Attackers exploiting this vulnerability could manipulate build processes or gain insights into infrastructure configurations, potentially facilitating further attacks or data leakage. The vulnerability's exploitation requires some level of authenticated access, limiting exposure to external unauthenticated attackers but posing a risk from insider threats or compromised accounts.

For European organizations, this vulnerability poses a risk primarily to the confidentiality and integrity of their CI/CD pipelines. Unauthorized triggering of builds can lead to unintended code execution or deployment, potentially introducing malicious code or disrupting development workflows. Exposure of job and cloud configuration data can reveal sensitive infrastructure details, aiding attackers in crafting targeted attacks or lateral movement within the network. Organizations in sectors with stringent compliance requirements (e.g., finance, healthcare, government) may face regulatory risks if such unauthorized access leads to data breaches. The impact is heightened in environments where Jenkins is integrated with critical production systems or where cloud infrastructure configurations contain sensitive credentials or secrets. Although the vulnerability does not affect availability, the potential for unauthorized access and information disclosure can undermine trust in software delivery processes and increase the attack surface for subsequent exploitation.

European organizations should immediately assess their Jenkins environments to identify usage of the MCP Server Plugin version 0.84.v50ca_24ef83f2 or earlier. Since no official patches are currently available, organizations should implement strict access controls on Jenkins instances, limiting plugin usage to trusted administrators and minimizing the number of users with privileges sufficient to exploit this vulnerability. Employ network segmentation and firewall rules to restrict access to Jenkins servers from untrusted networks. Enable and monitor detailed audit logging for build triggers and configuration access to detect anomalous activities. Consider disabling or removing the MCP Server Plugin if it is not essential to operations. Additionally, implement multi-factor authentication (MFA) for Jenkins user accounts to reduce the risk of compromised credentials. Regularly review and update Jenkins plugins and core to the latest versions once patches are released. Finally, conduct security awareness training for developers and administrators to recognize and report suspicious behavior related to CI/CD pipelines.