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CVE-2026-20643

MediumPublished

A cross-origin issue in the Navigation API was addressed with improved input validation. This issue is fixed in Background Security Improvements for iOS,...

Published: Mar 17, 2026
Updated: Aug 17, 2026
Assigning CNA: apple
Evidence observed: Aug 4, 2026

Primary CVSS

5.4/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 29.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

WebKit-NavigationAPI-SOP-BypassPoC
WebKit NavigateEvent.canIntercept SOP bypass via cross-port interception — iOS 26.3.1 BSI (CVE-2026-20643)
CVE-2026-20643Research
Test page and analysis for CVE-2026-20643, a WebKit vulnerability, including a diff reference and blog link for technical details.
CVE-2026-PoCsResearch
A community-curated, verified collection of Proof-of-Concept exploits for CVEs disclosed in 2026.

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