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Apple WebKit Vulnerability Enables Malicious Web Content Bypass on iOS and macOS

## WebKit Vulnerability and Security Updates

RBy Robert LangleyMar 19, 20261 min read

WebKit Vulnerability and Security Updates

Apple has issued security patches addressing a critical WebKit vulnerability that allows malicious web content to bypass the Same Origin Policy.

These updates, released on Tue, Mar 17, 2026, apply to the latest versions of Apple's operating systems, delivered through the Background Security Improvements mechanism.

The vulnerability, identified as CVE-2026-20643, was discovered by security researcher Thomas Espach. It arises from a cross-origin issue within the Navigation API of the WebKit framework.

The Same Origin Policy typically restricts how documents or scripts loaded by one origin can interact with resources from another origin. Exploiting this flaw can lead to unauthorized access to authentication tokens, user session hijacking, or data exfiltration.

Apple has issued security patches addressing a critical WebKit vulnerability that allows malicious web content to bypass the Same Origin Policy.
Robert Langley · Thehackingpost

Apple engineers have addressed this issue by enhancing input validation within the Navigation API, thereby closing the loophole for improper cross-origin navigation.

Apple distributed this fix as a Background Security Improvement, available with the 26.1 operating system versions. These updates provide crucial security protections for components such as the Safari browser, WebKit framework, and various system libraries.

Users experiencing compatibility issues after a patch can revert to the baseline software until the patch is integrated into a major release.

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The rapid updates are applicable to iOS 26.3.1, iPadOS 26.3.1, macOS 26.3.1, and macOS 26.3.2. Users should ensure their settings allow automatic patch installations to maintain protection against this vulnerability.

These configurations can be managed via the Privacy & Security menu on devices. On iPhones and iPads, this is accessible in the main Settings app, while Mac users can find it through System Settings via the Apple menu. Confirming that the "Automatically Install" feature is enabled ensures ongoing device protection.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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