CVE-2026-20643
Received Received - Intake
Cross-Origin Bypass in Apple Navigation API Enables Data Exposure

Publication date: 2026-03-17

Last updated on: 2026-03-25

Assigner: Apple Inc.

Description
A cross-origin issue in the Navigation API was addressed with improved input validation. This issue is fixed in Background Security Improvements for iOS, iPadOS, and macOS, Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, visionOS 26.4. Processing maliciously crafted web content may bypass Same Origin Policy.
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Meta Information
Published
2026-03-17
Last Modified
2026-03-25
Generated
2026-06-16
AI Q&A
2026-03-18
EPSS Evaluated
2026-06-15
NVD
CVE-2026-20643
EUVD
EUVD-2026-12663
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
apple ipados to 26.3.1 (exc)
apple iphone_os to 26.3.1 (exc)
apple macos to 26.3.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-346 The product does not properly verify that the source of data or communication is valid.
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
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Executive Summary

This vulnerability is a cross-origin issue in the Navigation API where maliciously crafted web content can bypass the Same Origin Policy. The Same Origin Policy is a security measure that restricts how documents or scripts loaded from one origin can interact with resources from another origin. The issue was addressed by improving input validation in the affected systems.

Impact Analysis

Because this vulnerability allows bypassing the Same Origin Policy, an attacker could potentially access or manipulate data from another origin without proper authorization. This could lead to unauthorized data exposure or manipulation when processing malicious web content.

Compliance Impact

I don't know

Detection Guidance

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Mitigation Strategies

To mitigate this vulnerability, update your Apple devices to the fixed versions: Background Security Improvements for iOS 26.3.1, iPadOS 26.3.1, macOS 26.3.1, or macOS 26.3.2.

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