CVE-2025-43466 is an injection vulnerability identified in Apple macOS, specifically addressed in the macOS Tahoe 26.1 update. The root cause is improper input validation, classified under CWE-95, which involves improper neutralization of directives in dynamically evaluated code. This flaw allows a local application with limited privileges (PR:L) to access sensitive user data without requiring user interaction (UI:N). The attack vector is local (AV:L), meaning the attacker must have some level of access to the system. The vulnerability does not affect system integrity or availability but compromises confidentiality by enabling unauthorized data access. The CVSS v3.1 base score is 5.5, reflecting a medium severity due to the limited attack vector and privileges required, but high impact on confidentiality. No known exploits have been reported in the wild, indicating limited current exploitation but potential risk if weaponized. The vulnerability affects all macOS versions prior to Tahoe 26.1, and Apple has addressed the issue by improving input validation mechanisms. This vulnerability highlights the importance of secure coding practices to prevent injection flaws that can lead to data leakage.

The primary impact of CVE-2025-43466 is the unauthorized disclosure of sensitive user data on affected macOS systems. Organizations relying on macOS devices for business operations, especially those handling sensitive or regulated data, face confidentiality risks if this vulnerability is exploited. While the attack requires local access and limited privileges, insider threats or malware that gains foothold on a device could leverage this flaw to escalate data access. The lack of required user interaction lowers the barrier for exploitation once local access is obtained. Although integrity and availability are not impacted, the breach of confidentiality can lead to data leaks, regulatory non-compliance, reputational damage, and potential financial losses. Enterprises with macOS endpoints in sectors such as finance, healthcare, and government are particularly at risk due to the sensitivity of data processed. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits over time.

To mitigate CVE-2025-43466, organizations should promptly update all macOS devices to version Tahoe 26.1 or later, where the vulnerability has been fixed through improved input validation. Beyond patching, organizations should enforce the principle of least privilege by restricting app permissions and limiting local user access to trusted applications only. Implement application whitelisting and endpoint protection solutions that can detect anomalous behavior indicative of exploitation attempts. Regularly audit installed applications and remove unnecessary or untrusted software to reduce the attack surface. Employ strong endpoint security policies, including device encryption and secure boot mechanisms, to protect data even if local access is compromised. Educate users about the risks of installing untrusted applications and the importance of maintaining updated systems. For environments with sensitive data, consider additional monitoring for unusual local access patterns or data exfiltration attempts. Finally, maintain an incident response plan that includes procedures for addressing potential data breaches stemming from such vulnerabilities.