The vulnerability identified as CVE-2025-53652 affects the Jenkins Git Parameter Plugin, specifically versions 439.vb_0e46ca_14534 and earlier. This plugin allows users to specify Git parameters for Jenkins builds, typically to select branches, tags, or commits. The core issue is a lack of validation: the plugin does not verify that the Git parameter value submitted during a build matches one of the predefined, offered choices. Consequently, an attacker with Item/Build permissions can inject arbitrary values into the Git parameter. This injection can lead to builds referencing unauthorized or malicious Git commits or branches, potentially introducing malicious code into the build process or bypassing intended code review and quality controls. The vulnerability is remotely exploitable without requiring user interaction or elevated privileges beyond Item/Build permissions, which are commonly granted to developers or automation users. The CVSS v3.1 score of 8.2 reflects a high severity, primarily due to the high confidentiality impact (unauthorized code injection) and low attack complexity. Although no public exploits are currently known, the vulnerability represents a significant risk to the integrity of CI/CD pipelines. The weakness aligns with CWE-20 (Improper Input Validation), emphasizing the importance of validating user-supplied data. The absence of an official patch link suggests that remediation may require plugin updates or configuration changes from Jenkins administrators.

For European organizations, this vulnerability poses a critical risk to the integrity of software development and deployment processes. Jenkins is widely used across Europe in both private and public sectors for continuous integration and continuous delivery (CI/CD). Exploitation could allow attackers to inject malicious code or unauthorized changes into builds, potentially leading to compromised software products, data breaches, or supply chain attacks. This is especially concerning for industries with stringent regulatory requirements such as finance, healthcare, and critical infrastructure. The confidentiality impact is high because attackers can influence which code is built and deployed, potentially inserting backdoors or vulnerabilities. The integrity of the build process is undermined, which can erode trust in software releases. Availability impact is low, as the vulnerability does not directly cause denial of service. However, the overall security posture of affected organizations could be severely damaged, leading to reputational harm and regulatory penalties.

To mitigate CVE-2025-53652, European organizations should implement the following specific measures: 1) Immediately review and restrict Jenkins Item/Build permissions to only trusted users, minimizing the attack surface. 2) Monitor and audit build parameters for unexpected or unauthorized Git references, using logging and alerting tools integrated with Jenkins. 3) If available, update the Jenkins Git Parameter Plugin to a version that includes input validation fixes; if no patch is yet released, consider disabling the plugin or replacing it with alternative solutions that enforce strict parameter validation. 4) Implement additional validation at the Jenkins pipeline or job configuration level to ensure that only allowed Git branches or tags are used in builds, possibly through scripted checks or external validation scripts. 5) Employ network segmentation and access controls to limit exposure of Jenkins servers to trusted networks and users. 6) Educate development and DevOps teams about the risks of parameter injection and the importance of secure build practices. 7) Regularly review Jenkins plugin inventories and update them promptly to reduce exposure to known vulnerabilities.