Microsoft Security Response CenterCVE-2026-70309

Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability

MediumVendor CVSS 5.4 / 10 1 CVE Published Aug 28, 2026 at 7:00 AM UTC

Summary

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

Release Notes

Aug 28, 2026 at 7:00 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Aug 28, 2026 at 9:40 PM UTC
Added to SecurityAlert
We collected the advisory from the official source.
Oct 28, 2026 at 3:45 AM UTC
Confirmed at the source
Our collector saw this advisory during a later source check.

Details collected from Microsoft Security Response Center.

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