Protection mechanism failure in WebKitGTK+ and WPE WebKit - CVE-2026-20643
Published: March 17, 2026 / Updated: March 30, 2026
Vulnerability identifier: #VU124085
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-20643
CWE-ID: CWE-693
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: WebKitGTK
Affected software:
WebKitGTK+
WPE WebKit
WebKitGTK+
WPE WebKit
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient implementation of security measures within the Navigation API in WebKit. A remote attacker can trick the victim into visiting a specially crafted website and bypass Same Origin Policy.
How to mitigate CVE-2026-20643
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.