Origin validation error in Microsoft Edge - CVE-2026-66313
Published: July 31, 2026 / Updated: August 2, 2026
Vulnerability identifier: #VU140714
CSH Severity: Low
CVSS v4 BT: 4.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2026-66313
CWE-ID: CWE-346
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information and perform limited tampering.
The vulnerability exists due to an origin validation error in Microsoft Edge (Chromium-based) when processing origin validation checks. A remote attacker can exploit the flaw to disclose sensitive information and perform limited tampering.
Affected software
Microsoft Edge
How to mitigate CVE-2026-66313
Install security update from vendor's website.
Microsoft Edge - update to 151.0.4129.59