Apple Patches WebKit Vulnerability CVE-2026-20643 Across iOS, macOS
ID: 4a484c8a-8b5a-52d3-ae2d-482519660eac
STIX ID: report--4a484c8a-8b5a-52d3-ae2d-482519660eac
Feed Name: The Cyber Express
Threat Score
Apple released background security updates to address WebKit vulnerability CVE-2026-20643 — a Navigation API cross-origin issue that could bypass the Same Origin Policy — via Background Security Improvements for iOS, iPadOS, and macOS (26.3.1 (a) / 26.3.2 (a)); the report also notes backported WebKit and kernel fixes for older iOS/iPadOS versions and advises IT/security teams to monitor, verify, and ensure deployment of these background patches.
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