CVE-2025-30663 is a high-severity vulnerability identified in Zoom Communications, Inc's Zoom Workplace Apps. It is classified as a CWE-367 Time-of-check Time-of-use (TOCTOU) race condition. This type of vulnerability arises when a system checks a condition (such as permissions or resource availability) and then uses the resource based on that check, but the state of the resource changes between the check and the use, allowing an attacker to exploit the timing gap. In this case, the flaw exists in Zoom Workplace Apps and allows an authenticated user with local access to escalate their privileges. The vulnerability requires the attacker to have some level of authenticated access to the system, but no user interaction is needed beyond that. The CVSS v3.1 base score is 8.8, indicating a high severity with the vector AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H, meaning the attack requires local access, low complexity, low privileges, no user interaction, and results in a scope change with high impact on confidentiality, integrity, and availability. Although no known exploits are currently reported in the wild, the vulnerability's nature and impact make it a critical concern for organizations using Zoom Workplace Apps. The lack of patch links suggests that a fix may not yet be publicly available or is pending release, emphasizing the need for immediate attention and mitigation strategies. The vulnerability could allow an attacker to gain elevated privileges on the local machine, potentially leading to full system compromise, data exfiltration, or disruption of services through the Zoom Workplace Apps environment.

For European organizations, this vulnerability poses a significant risk, especially in sectors heavily reliant on Zoom Workplace Apps for internal communications and collaboration. The escalation of privilege could allow malicious insiders or attackers who gain initial access to move laterally within networks, access sensitive corporate data, or disrupt business operations. Given the high impact on confidentiality, integrity, and availability, organizations could face data breaches, intellectual property theft, or operational downtime. This is particularly critical for industries such as finance, healthcare, government, and critical infrastructure in Europe, where data protection regulations like GDPR impose strict requirements on data security and breach notification. Exploitation could also undermine trust in communication platforms, impacting remote work and hybrid work models prevalent across Europe. The absence of known exploits currently provides a window for proactive defense, but the high severity score indicates that once exploited, the consequences could be severe and widespread.

European organizations should immediately conduct an inventory to identify all instances of Zoom Workplace Apps in their environment and verify affected versions. Until a patch is available, apply strict access controls to limit local access to systems running these apps, ensuring only trusted and necessary personnel have such access. Employ endpoint detection and response (EDR) tools to monitor for unusual privilege escalation attempts or suspicious local activity related to Zoom processes. Implement application whitelisting and sandboxing where feasible to contain potential exploitation. Regularly review and tighten user privilege assignments to adhere to the principle of least privilege, minimizing the risk from authenticated users. Additionally, organizations should stay in close contact with Zoom Communications for updates on patches or workarounds and plan for rapid deployment once fixes are released. Conduct security awareness training to inform users about the risks of local access vulnerabilities and encourage reporting of suspicious behavior. Network segmentation can also help contain potential lateral movement if exploitation occurs.