CVE-2026-85893: Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability

Overview

Severity

High (CVSS 8.8)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Edge - Chromium

Exploit Status

Not Exploited

Exploitation Likelihood

Unlikely

Patch Tuesday

2026-Sep

Released

2026-09-15

Description

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

FAQ

What privileges could be gained by an attacker who successfully exploited the vulnerability? An attacker could use this vulnerability to elevate privileges from a Low Integrity Level in a contained ("sandboxed") execution environment to a Medium Integrity Level. Please refer to AppContainer isolation and Mandatory Integrity Control for more information. According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do? The user must visit the attacker‑controlled webpage, and perform the two tap gestures that cause autofill to activate. What is the version information for this release? Microsoft Edge Version Date Released Based on Chromium Version 153.0.4234.32 09/10/2026 153.0.8010.37

Affected Products (1)

Browser

• Microsoft Edge (Chromium-based)

Acknowledgments

<a href="https://x.com/eternalsakura13">Nan Wang(@eternalsakura13) and Ziling Chen</a>

Revision History

• 2026-09-15: Information published.