What is CVE-2026-70339?

CVE-2026-70339 is a medium-severity vulnerability in Microsoft Edge (Chromium-based), classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 5.4/10. Published 2026-08-11.

How severe is CVE-2026-70339?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Microsoft Edge (Chromium-based)

CVE-2026-70339

Access of resource using incompatible type ('type confusion') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

Affected products

Microsoft Edge (Chromium-based) — versions 1.0.0.0

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-70339?: CVE-2026-70339 is a medium-severity vulnerability in Microsoft Edge (Chromium-based), classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 5.4/10. Published 2026-08-11.
How severe is CVE-2026-70339?: Medium severity. CVSS v3 base score is 5.4 out of 10.