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CVE-2026-66316Important

Microsoft Edge (Chromium-based) Spoofing Vulnerability

MSRC advisory NVD CVE.org

Assessment

Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.

Severity
Important
CVSS base score
5.4CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C
Impact
Spoofing
EPSS, next 30 days
0.2%Higher than 10.3% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
Exploitability
Exploitation Unlikely
Publicly disclosed
No
Customer action
Required: apply the update
Component
Microsoft Edge (Chromium-based)
Weakness
CWE-346: Origin Validation Error
Issued by
Microsoft
Published
31 Jul 2026 · July 2026
Last revised
31 Jul 2026

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

Browser
1 affected product
  • Microsoft Edge (Chromium-based)
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