CVE-2026-20643
Medium
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.
SeverityMedium
CVSS5.4
Exploit probability—
Product
Apple Ipados
PublishedMar 17, 2026
First seenMar 17, 2026
Weakness typeCWE-20Improper input validationCWE-346CWE-346
How to fix
Update
- apple ipados26.3.1 or later
- apple iphone_os26.3.1 or later
- apple macos26.3.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| apple ipados | v < 26.3.1 | 26.3.1 |
| apple iphone_os | v < 26.3.1 | 26.3.1 |
| apple macos | v < 26.3.1 | 26.3.1 |
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