CVE-2024-44212 is a vulnerability in Apple Safari's cookie management system that allows cookies belonging to one origin to be sent to another origin. This issue stems from improper state management within the browser's cookie handling logic, violating the same-origin policy that is fundamental to web security. The flaw affects Safari 18.0 and earlier versions, as well as Apple operating systems including iOS 18.0 and earlier, iPadOS 18.0 and earlier, macOS Sequoia versions prior to 15.1, tvOS 18.0 and earlier, visionOS 2.0 and earlier, and watchOS 11.0 and earlier. The vulnerability is classified under CWE-346, which relates to insufficient verification of data authenticity. Exploitation can occur remotely without requiring user interaction or privileges, making it accessible to attackers who can lure victims to malicious web pages or inject content into legitimate sites. The impact primarily concerns integrity, as attackers could manipulate or misuse cookies to perform unauthorized actions, such as session hijacking or cross-site request forgery (CSRF). Apple has fixed this issue in Safari 18.1 and corresponding OS updates by improving the state management of cookies to ensure strict origin separation. No known exploits have been reported in the wild as of the publication date. The CVSS v3.1 base score is 5.3, reflecting a medium severity level due to the lack of confidentiality impact and the absence of required user interaction or privileges.

The vulnerability could allow attackers to bypass the same-origin policy by causing cookies from one origin to be sent to another, potentially enabling session fixation, unauthorized actions, or cross-site request forgery attacks. This compromises the integrity of user sessions and may lead to unauthorized operations performed on behalf of users without their consent. While confidentiality and availability are not directly impacted, the integrity breach can facilitate further attacks such as privilege escalation or data manipulation within web applications. Organizations with employees or customers using affected Apple devices and Safari browsers are at risk of targeted attacks exploiting this flaw, especially in environments where sensitive web applications rely on cookie-based authentication. The risk is heightened in sectors with high-value targets such as finance, healthcare, and government, where session integrity is critical. Although no active exploits are known, the ease of remote exploitation without user interaction increases the urgency for patching.

Organizations should immediately deploy the Apple security updates that address this vulnerability: Safari 18.1, iOS 18.1, iPadOS 18.1, macOS Sequoia 15.1, tvOS 18.1, visionOS 2.1, and watchOS 11.1. Beyond patching, web developers should implement additional security controls such as using the SameSite cookie attribute set to 'Strict' or 'Lax' to limit cross-origin cookie transmission. Employing Content Security Policy (CSP) headers can reduce the risk of malicious content injection that might exploit this flaw. Monitoring web traffic for anomalous cookie behavior and conducting regular security audits of web applications can help detect exploitation attempts. Organizations should also educate users about the importance of updating their devices promptly and consider restricting access to sensitive web applications from unpatched devices. Network-level protections such as web application firewalls (WAFs) can be tuned to detect suspicious cross-origin requests that might leverage this vulnerability.