Improper access control in WebKitGTK+ and WPE WebKit - CVE-2026-64728

Vulnerability identifier: #VU143692

CSH Severity: Medium

CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-64728

CWE-ID: CWE-284

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to violate iframe sandboxing policy.

The vulnerability exists due to improper access control in WebKit when processing maliciously crafted web content. A remote attacker can send maliciously crafted web content to violate iframe sandboxing policy.

WebKitGTK+
WPE WebKit
visionOS
tvOS
macOS
iPadOS
Apple iOS
watchOS
Apple Safari

Install security update from vendor's website.

visionOS - update to 26.6
tvOS - update to 26.6 23L773
macOS - update to 26.6 25G72
Apple Safari - update to 26.6
iPadOS - update to 26.6 23G71
Apple iOS - update to 26.6 23G71
watchOS - update to 26.6 23U67

• https://support.apple.com/en-us/128073
• https://bugs.webkit.org/show_bug.cgi?id=313220

• Multiple vulnerabilities in WebKitGTK+ and WPE WebKit
• Multiple vulnerabilities in Apple Safari
• Multiple vulnerabilities in macOS Tahoe
• Multiple vulnerabilities in iOS 26 and iPadOS 26
• Multiple vulnerabilities in Apple visionOS
• Multiple vulnerabilities in Apple tvOS
• Multiple vulnerabilities in Apple watchOS