CVE-2024-54467 is a vulnerability identified in Apple Safari's cookie management system, affecting Safari 18 and earlier versions on iOS 18, iPadOS 18, macOS Sequoia 15, tvOS 18, visionOS 2, and watchOS 11. The root cause is an issue with state management related to cookies that allows a malicious website to perform cross-origin data exfiltration. This means that a website controlled by an attacker can bypass the same-origin policy protections and access or leak sensitive data from other origins or sites the user has visited. The vulnerability does not require any privileges or authentication but does require user interaction, such as visiting a malicious website. The CVSS v3.1 base score is 6.5, reflecting a medium severity level primarily due to the high impact on confidentiality, no impact on integrity or availability, and the ease of remote exploitation without privileges. Apple has addressed this issue by improving cookie state management in the latest Safari and OS releases. No public exploits or active exploitation in the wild have been reported to date. The vulnerability is categorized under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), emphasizing its nature as a data leakage flaw. This vulnerability underscores the critical need for browsers to enforce strict cross-origin data isolation and proper cookie handling to protect user privacy and security.

The primary impact of CVE-2024-54467 is the unauthorized disclosure of sensitive user data through cross-origin data exfiltration. This can lead to privacy breaches, exposure of personal information, session tokens, or other sensitive cookies that could be leveraged for further attacks such as session hijacking or targeted phishing. Organizations relying on Apple devices and Safari for web access may face increased risk of data leakage, potentially affecting user trust and compliance with data protection regulations. While the vulnerability does not affect system integrity or availability, the confidentiality breach can have significant reputational and legal consequences. The requirement for user interaction means social engineering or malicious advertising campaigns could be used to lure victims to exploit the flaw. Given the widespread use of Apple devices globally, especially in enterprise and consumer markets, the scope of affected systems is broad. However, the lack of known exploits in the wild currently limits immediate impact, though the risk remains until patches are widely deployed.

To mitigate CVE-2024-54467, organizations and users should promptly update Safari to version 18 or later and ensure all Apple operating systems (iOS 18, iPadOS 18, macOS Sequoia 15, tvOS 18, visionOS 2, watchOS 11) are updated to their respective patched versions. Enterprises should enforce update policies and monitor device compliance to reduce exposure. Network-level protections such as web filtering to block access to known malicious websites can reduce the risk of exploitation. Security awareness training should emphasize the dangers of interacting with suspicious websites to minimize user interaction risks. Additionally, organizations can implement Content Security Policy (CSP) headers and other browser security features to restrict cross-origin data flows where feasible. Monitoring network traffic for unusual outbound data patterns may help detect attempted exfiltration. Finally, developers and security teams should review web application cookie handling and ensure adherence to best practices for same-origin policy enforcement and cookie security attributes (e.g., HttpOnly, Secure, SameSite).