Origin validation error in Microsoft Edge - CVE-2026-66316
Published: July 31, 2026 / Updated: August 2, 2026
Vulnerability identifier: #VU140717
CSH Severity: Medium
CVSS v4 BT: 1.2 [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-2026-66316
CWE-ID: CWE-346
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform spoofing.
The vulnerability exists due to origin validation error in Microsoft Edge (Chromium-based) when handling an attacker-controlled webpage and autofill activation gestures. A remote attacker can lure a user to visit a crafted webpage and perform two tap gestures to perform spoofing.
User interaction is required to visit the attacker-controlled webpage and perform the two tap gestures that cause autofill to activate.
Affected software
Microsoft Edge
How to mitigate CVE-2026-66316
Install security update from vendor's website.
Microsoft Edge - update to 151.0.4129.59