CVE-2025-1161 is a vulnerability classified under CWE-648, which involves the incorrect use of privileged APIs within the Nomysem product developed by NomySost Information Technology Training and Consulting Inc. This vulnerability enables privilege escalation, meaning that an attacker with limited access rights can exploit the flaw to gain elevated privileges on the affected system. The vulnerability affects version 0 of Nomysem and is present through May 2025. The CVSS v3.1 score is 7.1, reflecting a high severity level, with the vector indicating network attack vector (AV:N), high attack complexity (AC:H), low privileges required (PR:L), user interaction required (UI:R), unchanged scope (S:U), and high impact on confidentiality, integrity, and availability (C:H/I:H/A:H). The incorrect use of privileged APIs typically means that the software calls system or application programming interfaces that require elevated privileges without proper validation or safeguards, allowing attackers to bypass security controls. Although no known exploits are currently reported in the wild, the vulnerability poses a significant risk due to its potential impact. The vulnerability was reserved in February 2025 and published in December 2025, indicating recent discovery and disclosure. The absence of patches at this time necessitates proactive mitigation steps by affected organizations.

For European organizations, this vulnerability poses a significant risk, especially for those deploying Nomysem in environments handling sensitive or critical data. Successful exploitation could lead to unauthorized privilege escalation, enabling attackers to access confidential information, modify or delete critical data, and disrupt services, thereby compromising confidentiality, integrity, and availability. Sectors such as finance, healthcare, government, and critical infrastructure are particularly vulnerable due to the potential for severe operational and reputational damage. The requirement for user interaction and high attack complexity somewhat limits exploitation but does not eliminate the risk, especially in targeted attacks or insider threat scenarios. The lack of known exploits currently provides a window for mitigation, but organizations must act promptly to reduce exposure. The network attack vector means that remote attackers could potentially exploit this vulnerability, increasing the threat surface for distributed and remote work environments common in Europe.

Given the absence of available patches, European organizations should implement the following specific mitigations: 1) Restrict network access to Nomysem systems using firewalls and network segmentation to limit exposure to untrusted networks. 2) Enforce strict user privilege management, ensuring users operate with the least privilege necessary and monitor for unusual privilege escalation attempts. 3) Implement multi-factor authentication (MFA) to reduce the risk of compromised credentials being leveraged for exploitation. 4) Conduct regular security audits and monitoring of API calls and system logs to detect anomalous behavior indicative of exploitation attempts. 5) Educate users about the risks of social engineering and the importance of cautious interaction with prompts or requests that could trigger the vulnerability. 6) Engage with the vendor for timely updates and patches, and prepare for rapid deployment once available. 7) Consider deploying application control or endpoint detection and response (EDR) solutions to detect and block exploitation attempts. These measures go beyond generic advice by focusing on controlling access, monitoring API usage, and preparing for patch deployment.