CVE-2025-53652 is a high-severity vulnerability affecting the Jenkins Git Parameter Plugin, specifically versions 439.vb_0e46ca_14534 and earlier. The vulnerability arises because the plugin does not properly validate that the Git parameter value submitted to a build matches one of the predefined, offered choices. This lack of validation allows an attacker who has Item/Build permission within Jenkins to inject arbitrary values into Git parameters. Since Jenkins is widely used for continuous integration and continuous deployment (CI/CD) pipelines, this flaw can be exploited to manipulate build parameters, potentially causing unauthorized code to be built or deployed. The vulnerability is classified under CWE-20 (Improper Input Validation), indicating that the root cause is insufficient validation of user-supplied input. The CVSS v3.1 base score is 8.2, reflecting a high severity due to its network attack vector, low attack complexity, no privileges required, no user interaction, and high impact on confidentiality with limited impact on integrity and no impact on availability. Although no known exploits are currently reported in the wild, the vulnerability's characteristics make it a significant risk, especially in environments where Jenkins is used to automate critical software delivery processes. Exploiting this vulnerability could allow attackers to influence the source code or parameters used in builds, potentially leading to the introduction of malicious code or unauthorized access to sensitive information processed during the build.

For European organizations, the impact of CVE-2025-53652 can be substantial, particularly for those relying heavily on Jenkins for their software development lifecycle. Exploitation could lead to unauthorized code injection or manipulation of build parameters, compromising the integrity of software artifacts and potentially introducing backdoors or vulnerabilities into production systems. This can result in intellectual property theft, disruption of software delivery, and erosion of trust in software integrity. Confidential data handled during builds, such as credentials or proprietary code, could be exposed, leading to data breaches. The vulnerability's exploitation does not require elevated privileges beyond Item/Build permission, which may be granted to a broad set of users or automated systems, increasing the attack surface. Given the critical role of CI/CD pipelines in modern software development, successful exploitation could affect availability indirectly by causing faulty builds or deployments, leading to downtime or service degradation. European organizations in sectors such as finance, healthcare, telecommunications, and government, which often have stringent compliance requirements and rely on secure software delivery, are particularly at risk.

To mitigate CVE-2025-53652, European organizations should take the following specific actions: 1) Immediately update the Jenkins Git Parameter Plugin to a version that addresses this vulnerability once an official patch is released by the Jenkins project. 2) Until a patch is available, restrict Item/Build permissions to trusted users only, minimizing the number of accounts that can submit builds with arbitrary parameters. 3) Implement strict access controls and audit logging on Jenkins instances to monitor and detect unusual parameter submissions or build activities. 4) Use Jenkins security best practices such as enabling Role-Based Access Control (RBAC) plugins to enforce least privilege principles. 5) Consider implementing additional validation or parameter whitelisting at the pipeline or script level to ensure only expected Git parameter values are accepted. 6) Regularly review and update CI/CD pipeline configurations to detect and remediate any unauthorized changes. 7) Educate development and DevOps teams about the risks associated with parameter injection and the importance of secure plugin management. 8) Employ network segmentation and firewall rules to limit Jenkins server exposure to trusted networks and users only. These measures, combined with timely patching, will reduce the risk of exploitation and limit potential damage.