Origin validation error in Microsoft Edge - CVE-2026-57978
Published: July 24, 2026 / Updated: July 25, 2026
Vulnerability identifier: #VU139358
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-2026-57978
CWE-ID: CWE-346
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Microsoft Edge
Microsoft Edge
Detailed vulnerability description
The vulnerability allows a remote attacker to perform spoofing.
The vulnerability exists due to origin validation error in Microsoft Edge (Chromium-based) when processing attacker-controlled web content. A remote attacker can host a specially crafted website and convince a user to view it to perform spoofing.
User interaction is required to visit the attacker-controlled webpage and perform two tap gestures that cause autofill to activate.
How to mitigate CVE-2026-57978
Install security update from vendor's website.