What is CVE-2026-70341?

CVE-2026-70341 is a high-severity vulnerability in Microsoft Edge, classified under Use After Free. CVSS score: 8.5/10. Published 2026-09-11.

How severe is CVE-2026-70341?

High severity. CVSS v3 base score is 8.5 out of 10.

Use After Free in Microsoft Edge

CVE-2026-70341

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

Vulnerability class: Use-After-Free

Published 2026-09-11 · last modified 2026-10-06.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (50.3th percentile), scored 2026-10-27.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.006 · change: -0.000

Affected products

Weakness classification (CWE)

CWE-416 — Use After Free

References

Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-70341?: CVE-2026-70341 is a high-severity vulnerability in Microsoft Edge, classified under Use After Free. CVSS score: 8.5/10. Published 2026-09-11.
How severe is CVE-2026-70341?: High severity. CVSS v3 base score is 8.5 out of 10.