CVE-2025-68165 is a reflected Cross-Site Scripting (XSS) vulnerability classified under CWE-79 found in JetBrains TeamCity, a popular continuous integration and deployment server. The flaw exists in the VCS Root setup interface in versions prior to 2025.11. Reflected XSS occurs when untrusted input is immediately returned by a web application without proper sanitization or encoding, allowing attackers to inject malicious JavaScript code. In this case, an attacker can craft a specially crafted URL or input that, when visited or submitted by a user with access to the TeamCity interface, executes arbitrary scripts in the victim’s browser context. This can lead to session hijacking, theft of sensitive information, or unauthorized actions performed on behalf of the user. The vulnerability does not require any privileges (PR:N) but does require user interaction (UI:R), such as clicking a malicious link. The attack vector is network-based (AV:N), and the attack complexity is low (AC:L). The impact on confidentiality and integrity is limited (C:L, I:L), with no impact on availability (A:N). No known public exploits have been reported yet, but the vulnerability is publicly disclosed and assigned a CVSS score of 5.4, indicating medium severity. The lack of a patch link suggests that a fix may be pending or recently released. JetBrains TeamCity is widely used in software development environments, making this vulnerability relevant to organizations relying on it for build automation and deployment pipelines.

For European organizations, the reflected XSS vulnerability in TeamCity could allow attackers to compromise user sessions, steal authentication tokens, or perform unauthorized actions within the TeamCity interface. This can lead to exposure of sensitive build configurations, source code repository credentials, or pipeline manipulations, potentially undermining the integrity of software delivery processes. While the vulnerability does not directly impact system availability, the confidentiality and integrity risks can facilitate further attacks, such as supply chain compromises or lateral movement within networks. Organizations with large development teams using TeamCity are at higher risk, especially if users are not trained to recognize phishing or malicious links. The medium severity indicates a moderate risk that should be addressed promptly to prevent exploitation, especially in environments where TeamCity is exposed to the internet or accessible by many users.

1. Update TeamCity to version 2025.11 or later as soon as the patch is available to eliminate the vulnerability. 2. Until patching is possible, restrict access to the TeamCity interface to trusted networks and users only, using VPNs or IP whitelisting. 3. Implement Web Application Firewall (WAF) rules to detect and block reflected XSS attack patterns targeting the VCS Root setup page. 4. Educate users about the risks of clicking on suspicious links, especially those that could lead to the TeamCity interface. 5. Review and harden input validation and output encoding on all TeamCity web pages, particularly those handling user-supplied data. 6. Monitor logs for unusual access patterns or attempts to exploit XSS vectors. 7. Consider deploying Content Security Policy (CSP) headers to reduce the impact of potential XSS attacks by restricting script execution sources.