Improper access control in WebKitGTK+ and WPE WebKit - CVE-2026-43821

Vulnerability identifier: #VU143696

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-43821

CWE-ID: CWE-284

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to read files outside of its sandbox.

The vulnerability exists due to improper access control in WebKit when an app accesses sandbox-restricted files. A local user can read files outside of its sandbox to read files outside of its sandbox.

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=314867

• 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