CVE-2025-13155 is a vulnerability identified in the Lenovo Baiying Client software, categorized under CWE-276, which relates to incorrect default permissions. This flaw allows a local authenticated user to execute arbitrary code with elevated privileges due to improper permission settings on files or resources within the application. The vulnerability does not require user interaction and can be exploited with low attack complexity, given the attacker already has some level of local access (low privileges). The CVSS 4.0 base score of 8.5 reflects the high impact on confidentiality, integrity, and availability, as the attacker can gain control over the system or sensitive components by escalating privileges. The vulnerability affects version '0' of the product, which likely refers to initial or unspecified versions. No public exploits have been reported yet, but the risk remains significant due to the nature of privilege escalation vulnerabilities. The issue was reserved in November 2025 and published in December 2025, indicating recent discovery. Lenovo has not yet provided a patch link, so mitigation currently relies on manual permission audits and limiting local user access. This vulnerability is particularly concerning for environments where multiple users share systems or where local user accounts have limited restrictions, as it can lead to full system compromise.

For European organizations, this vulnerability poses a serious threat, especially in sectors such as finance, healthcare, government, and critical infrastructure where Lenovo devices and software are commonly used. Successful exploitation could allow attackers with local access to escalate privileges, potentially leading to unauthorized access to sensitive data, disruption of services, or deployment of further malware with elevated rights. The impact on confidentiality, integrity, and availability is high, as attackers could manipulate system configurations, install persistent backdoors, or disable security controls. Since the vulnerability requires local authentication, the risk is elevated in environments with multiple users or where endpoint security is weak. The absence of known exploits in the wild provides a window for proactive mitigation, but the high CVSS score and ease of exploitation mean that organizations should prioritize addressing this issue to prevent lateral movement and privilege escalation within their networks.

Organizations should immediately audit the permissions of files and resources associated with the Lenovo Baiying Client to identify and correct any improper default permissions. Restrict local user privileges to the minimum necessary, employing the principle of least privilege to reduce the risk of exploitation. Monitor local user activities for unusual behavior indicative of privilege escalation attempts. Implement application whitelisting and endpoint detection and response (EDR) solutions to detect and block unauthorized code execution. Since no official patch is currently available, maintain close communication with Lenovo for updates and apply patches promptly once released. Consider isolating systems running the Baiying Client or limiting its installation to trusted users only. Conduct regular security training to raise awareness about the risks of local privilege escalation. Finally, review and enhance overall endpoint security policies to prevent unauthorized local access.