CVE-2025-67739 is a vulnerability identified in JetBrains TeamCity, a popular continuous integration and continuous deployment (CI/CD) server, affecting versions before 2025.11.2. The root cause is improper validation of repository URLs, categorized under CWE-939 (Improper Neutralization of Special Elements in Data Query Logic). This flaw allows an attacker to craft repository URLs that cause the server to disclose local file system paths. Such information disclosure can reveal directory structures, configuration details, or other sensitive information that could facilitate further attacks such as targeted exploitation or lateral movement. The vulnerability is exploitable remotely over the network without user interaction but requires low-level privileges, indicating that an attacker must have some access to the TeamCity server or network. The CVSS v3.1 score is 3.1 (low severity), reflecting limited confidentiality impact and no effect on integrity or availability. No public exploits have been reported, and JetBrains has published the vulnerability details with a fix available in version 2025.11.2. The lack of patch links in the provided data suggests users should consult official JetBrains resources for updates. This vulnerability is primarily a reconnaissance risk, potentially aiding attackers in mapping internal environments.

For European organizations, the primary impact is the potential leakage of internal directory structures and repository paths from TeamCity servers. While this does not directly compromise data integrity or system availability, it can provide attackers with valuable intelligence to plan more sophisticated attacks, such as privilege escalation or targeted malware deployment. Organizations heavily reliant on TeamCity for software development and deployment, especially those integrating with multiple repositories, may face increased risk of information exposure. This could be particularly sensitive in sectors like finance, healthcare, or critical infrastructure where internal architecture confidentiality is paramount. The vulnerability's low severity and lack of known exploits reduce immediate risk, but unpatched systems could be leveraged in multi-stage attacks. Additionally, the exposure of local paths might reveal naming conventions or environment details that facilitate social engineering or insider threats.

European organizations should prioritize updating JetBrains TeamCity installations to version 2025.11.2 or later, where the vulnerability is fixed. Until patched, restrict network access to TeamCity servers to trusted IPs and enforce strict access controls to limit low-privilege user capabilities. Implement network segmentation to isolate CI/CD infrastructure from broader enterprise networks. Conduct regular audits of TeamCity configurations and repository URL inputs to detect anomalous or malformed entries. Employ monitoring and alerting on unusual repository URL requests or access patterns that could indicate exploitation attempts. Educate development and operations teams about the risks of exposing internal paths and encourage secure coding and configuration practices. Finally, maintain an incident response plan that includes reconnaissance activity detection to quickly respond if information leakage is suspected.