CVE-2025-46291 is a logic flaw in Apple macOS's Gatekeeper security mechanism, which is responsible for verifying the trustworthiness of applications before execution. Gatekeeper typically blocks apps that are unsigned or not notarized by Apple, protecting users from running potentially malicious software. The vulnerability arises from insufficient validation logic, allowing a malicious or crafted application to bypass these Gatekeeper checks and execute without proper authorization. This bypass undermines the integrity of the system by permitting unauthorized code to run, potentially leading to further compromise. The vulnerability requires local access and user interaction, as the attacker must convince the user to run the malicious app. The CVSS score of 5.5 reflects a medium severity, with low attack vector (local), low attack complexity, no privileges required, but user interaction necessary. The flaw is addressed in macOS Tahoe 26.2, where Apple improved validation logic to close this bypass. No public exploits or widespread attacks have been reported to date. The vulnerability is classified under CWE-693, which relates to protection mechanism failures due to logic errors. Organizations relying on macOS should be aware of this issue and apply the update promptly to maintain system integrity.

The primary impact of CVE-2025-46291 is on the integrity of macOS systems. By bypassing Gatekeeper, attackers can run unauthorized applications that may install malware, steal data, or perform other malicious actions. Although confidentiality and availability are not directly affected, the ability to execute untrusted code can lead to broader compromise scenarios, including privilege escalation or persistence. The requirement for local access and user interaction limits the scope of exploitation, reducing the risk of remote or automated attacks. However, in environments where users may be tricked into running malicious apps—such as enterprise settings with less security awareness or targeted attacks—this vulnerability poses a significant threat. Organizations with sensitive data or critical infrastructure running macOS are at risk of targeted exploitation. The absence of known exploits in the wild suggests limited current threat but does not preclude future attacks once the vulnerability becomes widely known.

To mitigate CVE-2025-46291, organizations should immediately update all affected macOS systems to version Tahoe 26.2 or later, where the vulnerability is fixed. Beyond patching, administrators should enforce strict application whitelisting policies and restrict the ability of users to install or run unapproved software. User education is critical to reduce the risk of social engineering attacks that rely on user interaction to trigger exploitation. Employ endpoint detection and response (EDR) solutions capable of monitoring for unusual application execution patterns that might indicate Gatekeeper bypass attempts. Regularly audit installed applications and system logs for signs of unauthorized software execution. For high-security environments, consider additional controls such as disabling local user installation privileges or using mobile device management (MDM) tools to enforce security policies. Monitoring Apple security advisories for updates on this vulnerability and related threats is also recommended.