CVE-2025-43391 is a privacy vulnerability identified in Apple iOS and iPadOS operating systems, specifically related to the improper handling of temporary files by applications. This flaw allows a malicious or compromised app to access sensitive user data that it normally should not be able to reach. The vulnerability stems from inadequate isolation or cleanup of temporary files, which may contain confidential information. Apple addressed this issue in iOS 26.1, iPadOS 26.1, and corresponding macOS updates (Sequoia 15.7.2, Sonoma 14.8.2, Tahoe 26.1). The CVSS v3.1 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N) indicates that exploitation requires local access (e.g., an installed app), low attack complexity, no privileges, and user interaction, with a high impact on confidentiality but no impact on integrity or availability. The vulnerability is classified under CWE-200 (Exposure of Sensitive Information). There are no known exploits in the wild at the time of publication. The issue highlights the risks of temporary file management on mobile platforms and the importance of strict data access controls within app sandboxes.

The primary impact of CVE-2025-43391 is the unauthorized disclosure of sensitive user data on affected Apple devices. This can lead to privacy violations, potential identity theft, or leakage of confidential information stored temporarily by legitimate apps. Since the vulnerability does not affect data integrity or system availability, it does not enable data modification or denial of service. However, the ease of exploitation by any app installed on the device with user interaction means that attackers could leverage social engineering or malicious apps to gain access to private data. Organizations relying on Apple mobile platforms for sensitive communications or data storage face increased risk of data breaches if devices are not promptly updated. The absence of required privileges lowers the barrier for exploitation, increasing the threat surface. While no active exploits are known, the vulnerability could be targeted in the future, especially in environments with high-value data or targeted surveillance interests.

To mitigate CVE-2025-43391, organizations and users should immediately update affected devices to iOS 26.1, iPadOS 26.1, or the corresponding macOS versions where the fix is applied. Beyond patching, restrict app installations to trusted sources only, such as the official Apple App Store, to reduce the risk of malicious apps exploiting this vulnerability. Implement strict app permission policies and regularly audit installed applications for suspicious behavior, particularly those requesting access to file systems or temporary storage. Employ mobile device management (MDM) solutions to enforce update compliance and app restrictions. Educate users about the risks of installing untrusted apps and the importance of user interaction in exploitation scenarios. Monitoring for unusual file access patterns or data exfiltration attempts can provide early detection of exploitation attempts. Finally, consider encrypting sensitive data within apps to minimize exposure even if temporary files are accessed.