Edge: use after free lets an authorized attacker gain privileges

high severity · published 2026-10-29

A use-after-free in Microsoft Edge (Chromium-based) allows an authorized attacker to elevate privileges over a network. Microsoft fixed it in version 155.0.4283.45.

Fixed in: 155.0.4283.45

CVE: CVE-2026-85899

Source: NVD

Am I affected?

You are affected if the installed version is older than 155.0.4283.45. Check the version you have and update to 155.0.4283.45 or later. The fixed version is verified against a vendor or advisory source.

Get the fix

FixLane has a reviewed fix procedure for this incident: a read-only check first, then the fix. Ask the Telegram bot, or connect an AI agent to the FixLane MCP server and call get_fix_prompt with incident id 626 and your operating system.