What is CVE-2026-66315?

CVE-2026-66315 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-66315 cover?

CVE-2026-66315 covers the following CVE IDs: CVE-2026-66315. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-66315?

CVE-2026-66315 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-66315?

CVE-2026-66315 affects 1 product, including: Microsoft Edge (Chromium-based).

CVE-2026-66315HighCVSS 7.5

Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

July 31, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-66315 →

📋 Description

Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

🎯 Affected products1

Microsoft Edge (Chromium-based)

✅ Remediation

KBRelease Notes (Security Update) — fixed build 151.0.4129.59

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66315
referencehttps://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security