CVE-2026-85899: Microsoft Edge (Chromium-based) (High, CVSS 8.1)

CVE record · updated Oct 29, 2026

CVE-2026-85899HighMicrosoft Edge (Chromium-based)

CVSS: 8.1 High (v3.1)
Exploited in the wild: Not on CISA’s KEV list
Public exploit: None reported in public exploit databases
Weakness: CWE-416
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Published: Oct 29, 2026

What it is

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

Description from the National Vulnerability Database.

What to do

Check whether you run Microsoft Edge (Chromium-based), then apply the vendor’s fix or mitigation from the advisories below.

Sources: NVD, FIRST EPSS, CISA KEV, and public exploit databases (availability only). ThreatRoundup reports whether public exploit code exists but never links to it: fake proof-of-concepts that infect security researchers are common. This page updates automatically.