What is CVE-2026-66313?

CVE-2026-66313 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Microsoft Edge (Chromium-based) Tampering Vulnerability

Which CVE IDs does CVE-2026-66313 cover?

CVE-2026-66313 covers the following CVE IDs: CVE-2026-66313. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-66313?

CVE-2026-66313 has a CVSS v3 base score of 6.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-66313?

CVE-2026-66313 affects 1 product, including: Microsoft Edge (Chromium-based).

CVE-2026-66313HighCVSS 6.8

Microsoft Edge (Chromium-based) Tampering Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

July 31, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-66313 →

📋 Description

Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.

🎯 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-2026-66313
referencehttps://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security