What is CVE-2026-66323?

CVE-2026-66323 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-2026-66323 cover?

CVE-2026-66323 covers the following CVE IDs: CVE-2026-66323. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-66323?

CVE-2026-66323 has a CVSS v3 base score of 5.4, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-66323?

CVE-2026-66323 affects 5 products, including: Microsoft Edge for Android; Microsoft Edge for Linux; Microsoft Edge for MAC; Microsoft Edge for Windows; Microsoft Edge for iOS.

CVE-2026-66323HighCVSS 5.4

Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

August 28, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-66323 →

📋 Description

Improper neutralization of parameter/argument delimiters in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

🎯 Affected products5

Microsoft Edge for Android
Microsoft Edge for Linux
Microsoft Edge for MAC
Microsoft Edge for Windows
Microsoft Edge for iOS

✅ Remediation

KBRelease Notes (Security Update) — fixed build 152.0.4191.52

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66323
referencehttps://learn.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security