Cross-Origin Navigation API Bypass (iOS/macOS) Fixed in 26.3.1/2
CVE-2026-20643 Published on March 17, 2026
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.
Vulnerability Analysis
CVE-2026-20643 can be exploited with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Types
Improper Input Validation
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.
Origin Validation Error
The software does not properly verify that the source of data or communication is valid.
Products Associated with CVE-2026-20643
Want to know whenever a new CVE is published for Apple products? stack.watch will email you.
Affected Versions
Apple Safari:- Before 26.4 is affected.
- Before 18.7.7 is affected.
- Before 26.3.1 (a) is affected.
- Before 26.4 is affected.
- Before 26.3.1 (a) is affected.
- Before 26.3.2 (a) is affected.
- Before 26.4 is affected.
- Before 26.4 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.