What’s Vulnerable › Vulnerabilities

CVE-2026-20643

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-17 · updated 2026-10-26
• Weakness: CWE-20

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.

Affected products

• Apple iPadOS: before 26.3.1 — fixed in 26.3.1
• Apple Iphone Os: before 26.3.1 — fixed in 26.3.1
• Apple macOS: before 26.3.1 — fixed in 26.3.1
• Apple iOS and iPadOS: before 18.7.7; before 26.3.1 (a); before 26.4 — fixed in 18.7.7, 26.3.1 (a), 26.4
• Apple macOS: before 26.3.1 (a); before 26.3.2 (a); before 26.4 — fixed in 26.3.1 (a), 26.3.2 (a), 26.4
• Apple Safari: before 26.4 — fixed in 26.4
• Apple visionOS: before 26.4 — fixed in 26.4

How to fix

Upgrade to a fixed version: Apple iPadOS 26.3.1; Apple Iphone Os 26.3.1; Apple macOS 26.3.1; Apple iOS and iPadOS 18.7.7, 26.3.1 (a), 26.4; Apple macOS 26.3.1 (a), 26.3.2 (a), 26.4; Apple Safari 26.4; Apple visionOS 26.4. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/126604
• https://support.apple.com/en-us/126792
• https://support.apple.com/en-us/126793
• https://support.apple.com/en-us/126794
• https://support.apple.com/en-us/126799
• https://support.apple.com/en-us/126800
• http://seclists.org/fulldisclosure/2026/Mar/10

Get alerted when CVE-2026-20643 or the next vulnerability affects your stack