CVE-2025-58458 is a security vulnerability identified in the Jenkins Git client Plugin, specifically in versions 6.3.2 and earlier. The vulnerability arises from the way the plugin validates the Git URL field when using the `amazon-s3` protocol with JGit. The validation process behaves differently depending on whether a specified file path exists on the Jenkins controller's file system. This discrepancy in validation responses allows an attacker who has Overall/Read permission within Jenkins to infer the existence of arbitrary file paths on the Jenkins controller. Essentially, this is a form of information disclosure vulnerability that can be exploited to perform file existence checks on the controller's file system. Although the attacker requires some level of permission (Overall/Read), which is not the highest privilege level, this permission is commonly granted to many Jenkins users in typical CI/CD environments. The vulnerability does not appear to allow direct code execution or privilege escalation but can be leveraged as a reconnaissance step in a broader attack chain. No known exploits are currently reported in the wild, and no CVSS score has been assigned yet. The vulnerability was published on September 3, 2025, and is currently in a published state without an available patch link, indicating that mitigation or patching guidance may be pending or in progress.

For European organizations using Jenkins with the Git client Plugin, this vulnerability poses a risk primarily related to information disclosure. Attackers with read-level access can map the file system structure of the Jenkins controller, potentially uncovering sensitive files such as configuration files, credentials, or scripts that could aid in further attacks. This reconnaissance capability can facilitate lateral movement or privilege escalation if combined with other vulnerabilities or misconfigurations. Organizations with complex CI/CD pipelines relying heavily on Jenkins for automation and deployment are particularly at risk, as the Jenkins controller often holds critical secrets and access credentials. The impact is heightened in environments where access controls are lax or where many users have read permissions. While the vulnerability does not directly compromise system integrity or availability, the information gained can be leveraged to stage more damaging attacks. Given the widespread use of Jenkins in European enterprises, especially in technology, finance, and manufacturing sectors, the vulnerability could have broad implications if exploited.

To mitigate this vulnerability, European organizations should: 1) Immediately review and tighten Jenkins user permissions, ensuring that only trusted users have Overall/Read access, and apply the principle of least privilege rigorously. 2) Monitor Jenkins logs for unusual or repeated attempts to validate Git URLs using the `amazon-s3` protocol, which could indicate exploitation attempts. 3) Temporarily disable or restrict the use of the `amazon-s3` protocol in the Git client Plugin if feasible until a patch is released. 4) Keep Jenkins and all plugins up to date, and apply any forthcoming patches addressing this vulnerability as soon as they become available. 5) Implement network segmentation and access controls to limit who can reach the Jenkins controller, reducing the attack surface. 6) Conduct regular security audits and penetration testing focused on Jenkins environments to detect potential exploitation or misconfigurations. 7) Educate Jenkins users about the risks of excessive permissions and encourage reporting of suspicious activity.