WebKit vulnerabilities refer to security flaws in Apple’s web rendering engine, which powers Safari, Mail, and the App Store on iOS and macOS.
What this means is that the CVE-2026-20643 vulnerability makes it possible for a malicious website to pretend to be another site, maybe one you trust, and then read or steal information that should be kept separate. Normally, browsers enforce a rule called the “same‑origin policy,” which is like a strict fence that stops one site from peeking into another site’s data. This bug could help cybercriminals cut through that fence. In practical terms, an attacker would first have to lure you to a specially crafted web page.
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Source: Malwarebytes Labs
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