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CVE-2026-70309: Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-10-30
• Weakness: CWE-346

Description

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

Affected products

• Microsoft Edge (Chromium): before 150.0.4078.65 — fixed in 150.0.4078.65
• Microsoft Edge (Chromium): from 1.0.0.0 before 150.0.4078.65 — fixed in 150.0.4078.65

How to fix

Upgrade to a fixed version: Microsoft Edge (Chromium) 150.0.4078.65; Microsoft Edge (Chromium) 150.0.4078.65. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70309

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