CVE-2025-59457 is a high-severity vulnerability identified in JetBrains TeamCity, a widely used continuous integration and continuous deployment (CI/CD) server. The vulnerability is classified under CWE-183, which pertains to the improper handling of relative paths or path traversal issues. Specifically, in versions of TeamCity prior to 2025.07.2, there is a missing validation of Git repository URLs on Windows platforms. This flaw allows an attacker with at least low-level privileges (PR:L) on the network (AV:N) to craft malicious Git URLs that can lead to credential leakage. The vulnerability does not require user interaction (UI:N) and has a scope that affects confidentiality (C:H) but does not impact integrity or availability (I:N/A:N). The vulnerability arises because TeamCity fails to properly validate or sanitize Git URLs, potentially allowing attackers to access sensitive credentials stored or used by the system when interacting with Git repositories. Since TeamCity is often integrated into enterprise development pipelines, the leakage of credentials could expose source code repositories, internal systems, or other sensitive resources. Although no known exploits are currently reported in the wild, the CVSS score of 7.7 indicates a high risk due to the ease of exploitation over the network with minimal privileges and no user interaction required. The vulnerability is specific to Windows environments, which is significant given the prevalence of Windows servers in many enterprise settings. No official patches or updates are linked yet, but the issue is resolved in TeamCity version 2025.07.2 and later.

For European organizations, this vulnerability poses a significant risk to the confidentiality of sensitive development credentials and potentially the source code itself. Many European enterprises rely on JetBrains TeamCity for their CI/CD workflows, especially in software development, financial services, manufacturing, and telecommunications sectors. Credential leakage could lead to unauthorized access to private Git repositories, enabling intellectual property theft, insertion of malicious code, or further lateral movement within corporate networks. Given the vulnerability affects Windows-based TeamCity servers, organizations running these environments are particularly at risk. The compromise of CI/CD credentials can disrupt development pipelines and erode trust in software integrity, which is critical for compliance with European regulations such as GDPR and NIS Directive. Additionally, the exposure of credentials could facilitate supply chain attacks, which have become a growing concern in Europe. The absence of known exploits in the wild currently provides a window for mitigation, but the high CVSS score and ease of exploitation warrant urgent attention.

European organizations should prioritize upgrading JetBrains TeamCity installations to version 2025.07.2 or later as soon as possible to remediate this vulnerability. Until patching is complete, organizations should implement strict network segmentation to limit access to TeamCity servers, especially restricting access to trusted administrators and build agents only. Review and rotate any Git credentials or tokens used by TeamCity to prevent misuse of potentially leaked credentials. Implement monitoring and alerting for unusual Git repository access patterns or authentication failures. Employ application-layer firewalls or endpoint detection solutions to detect anomalous requests targeting TeamCity Git URL handling. Additionally, enforce the principle of least privilege on TeamCity service accounts and audit their permissions regularly. Consider temporarily disabling Git repository integrations on Windows TeamCity servers if feasible until patches are applied. Finally, maintain up-to-date backups of CI/CD configurations and credentials to enable rapid recovery if compromise is detected.