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CVE-2026-66312: Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-03 · updated 2026-10-28
• Weakness: CWE-126

Description

Buffer over-read in Microsoft Edge (Chromium-based) allows an authorized attacker to execute code over a network.

Affected products

• Microsoft Edge (Chromium): before 151.0.4129.59 — fixed in 151.0.4129.59
• Microsoft Edge (Chromium): from 1.0.0.0 before 151.0.4129.59 — fixed in 151.0.4129.59

How to fix

Upgrade to a fixed version: Microsoft Edge (Chromium) 151.0.4129.59; Microsoft Edge (Chromium) 151.0.4129.59. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66312

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