CVE-2025-49737 is a race condition vulnerability classified under CWE-362, affecting Microsoft Teams for Mac, New Edition version 1.0.0.0. The flaw arises from improper synchronization when multiple threads or processes concurrently access shared resources, leading to inconsistent or unexpected states. This condition can be exploited by an authorized attacker with local access and low privileges to gain elevated privileges on the affected system. The vulnerability does not require user interaction but has a high attack complexity, indicating that exploitation may require detailed knowledge of the system's internal operations and timing. The CVSS v3.1 score is 7.0 (high), reflecting the significant impact on confidentiality, integrity, and availability if exploited. The vulnerability could allow attackers to execute code or commands with higher privileges, potentially compromising sensitive data or disrupting system operations. Currently, no patches or fixes have been published, and no known exploits are reported in the wild. The vulnerability was reserved in June 2025 and published in July 2025, indicating recent discovery. This flaw specifically affects the Mac version of Microsoft Teams, which is widely used in enterprise environments for collaboration and communication, making it a critical concern for organizations relying on this platform.

The impact of CVE-2025-49737 is substantial for organizations using Microsoft Teams for Mac, New Edition. Successful exploitation allows local attackers to escalate privileges, potentially gaining administrative or system-level access. This can lead to unauthorized access to sensitive communications, data leakage, or disruption of collaboration services. The compromise of Teams could also serve as a foothold for lateral movement within enterprise networks, increasing the risk of broader breaches. Since Teams is integral to many organizations' workflows, any disruption or data compromise can affect business continuity and trust. The vulnerability affects confidentiality by exposing sensitive information, integrity by allowing unauthorized changes, and availability by potentially disrupting service. Although exploitation requires local access and high complexity, insider threats or attackers who have already compromised low-level accounts could leverage this flaw to deepen their control. The absence of patches increases the window of exposure, emphasizing the need for immediate mitigations.

To mitigate CVE-2025-49737, organizations should implement strict access controls to limit local user privileges on macOS systems running Microsoft Teams for Mac, New Edition. Employing the principle of least privilege reduces the risk of low-privileged users exploiting the vulnerability. Monitoring and logging local user activities can help detect suspicious behavior indicative of exploitation attempts. Network segmentation and endpoint detection and response (EDR) tools should be used to identify and contain potential lateral movement following privilege escalation. Until an official patch is released, consider restricting or temporarily disabling the vulnerable Teams version on critical systems. Regularly check for updates from Microsoft and apply patches promptly once available. Additionally, educating users about the risks of local privilege escalation and enforcing strong endpoint security policies can further reduce exposure. For environments with high security requirements, consider alternative communication tools or platforms until the vulnerability is resolved.