CVE-2025-43399 is a vulnerability in Apple iOS and iPadOS that allows malicious applications to access protected user data due to inadequate redaction of sensitive information. The root cause relates to a failure in properly sanitizing or restricting access to confidential data elements within the operating system, categorized under CWE-359 (Exposure of Sensitive Information to an Unauthorized Actor). This flaw enables an app, without requiring any privileges or user interaction, to bypass normal data protection mechanisms and read sensitive user information. The vulnerability affects multiple Apple platforms, including iOS, iPadOS, and macOS (Sequoia and Tahoe versions), and was addressed in updates 18.7.2 for iOS and iPadOS, and corresponding macOS patches. The CVSS v3.1 score of 7.5 reflects a high severity due to the vulnerability’s network attack vector, low complexity, no privileges required, no user interaction, and high confidentiality impact, while integrity and availability remain unaffected. No known exploits have been reported in the wild yet, but the potential for data leakage is significant. The vulnerability’s disclosure date is November 4, 2025, with the issue reserved earlier in April 2025. The lack of required authentication and user interaction makes this vulnerability particularly dangerous, as any app installed on a vulnerable device could exploit it to access sensitive data silently. The fix involves improved redaction and handling of sensitive information within the OS to prevent unauthorized access by apps.

The primary impact of CVE-2025-43399 is the unauthorized disclosure of protected user data, which can lead to privacy violations, identity theft, and leakage of sensitive personal or corporate information. Since the vulnerability does not affect data integrity or system availability, the main concern is confidentiality compromise. Attackers could leverage this flaw to extract sensitive information such as credentials, personal identifiers, or confidential documents from affected devices. For organizations, this could result in data breaches, regulatory non-compliance, reputational damage, and financial losses. Because exploitation requires no privileges or user interaction, the attack surface is broad, increasing the likelihood of exploitation if devices remain unpatched. The vulnerability affects a wide range of Apple devices, including iPhones, iPads, and Macs running the specified OS versions, which are widely used globally in both consumer and enterprise environments. This elevates the risk for sectors handling sensitive data, such as finance, healthcare, government, and technology. The absence of known exploits in the wild currently provides a window for remediation, but the high severity score indicates urgent patching is necessary to prevent future attacks.

To mitigate CVE-2025-43399, organizations and users should immediately update affected Apple devices to iOS 18.7.2, iPadOS 18.7.2, macOS Sequoia 15.7.2, or macOS Tahoe 26.1 as applicable. Beyond patching, organizations should implement strict app vetting policies, restricting installation to trusted sources such as the Apple App Store and employing Mobile Device Management (MDM) solutions to enforce app installation controls. Monitoring device logs and network traffic for unusual app behavior or data exfiltration attempts can help detect exploitation attempts. Employing data loss prevention (DLP) tools tailored for mobile and macOS environments can provide additional safeguards against unauthorized data access. Educating users about the risks of installing untrusted apps and maintaining up-to-date backups will aid in recovery if a breach occurs. For enterprise environments, segmenting sensitive data access and applying the principle of least privilege on devices can reduce exposure. Finally, staying informed about Apple security advisories and promptly applying future updates is critical to maintaining security posture.