Origin validation error in Microsoft Edge - CVE-2026-66322
Published: July 31, 2026 / Updated: August 2, 2026
Vulnerability identifier: #VU140721
CSH Severity: Medium
CVSS v4 BT: 4.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2026-66322
CWE-ID: CWE-346
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information and spoof content.
The vulnerability exists due to origin validation error in Microsoft Edge (Chromium-based) when processing an attacker-controlled webpage and autofill activation gestures. A remote attacker can craft a webpage that triggers autofill after the user performs the required gestures to disclose sensitive information and spoof content.
User interaction is required: the user must visit the attacker-controlled webpage and perform two tap gestures that cause autofill to activate.
Affected software
Microsoft Edge
How to mitigate CVE-2026-66322
Install security update from vendor's website.
Microsoft Edge - update to 151.0.4129.59