What is CVE-2026-56646?

CVE-2026-56646 is a medium-severity vulnerability in Microsoft Edge Chromium, classified under Information Disclosure. CVSS score: 6.5/10. Published 2026-07-03.

How severe is CVE-2026-56646?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Information disclosure in Microsoft Edge Chromium

CVE-2026-56646

Exposure of sensitive information to an unauthorized actor in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.

Vulnerability class: Information Disclosure

EPSS: 0.007 (48.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Microsoft Edge_chromium
Microsoft Edge (Chromium-based) — versions 1.0.0.0

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

Microsoft Edge (Chromium-based) Spoofing Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-56646?: CVE-2026-56646 is a medium-severity vulnerability in Microsoft Edge Chromium, classified under Information Disclosure. CVSS score: 6.5/10. Published 2026-07-03.
How severe is CVE-2026-56646?: Medium severity. CVSS v3 base score is 6.5 out of 10.