PT-2026-3326 · Microsoft · Edge

Alex Bernier · Published 2026-01-16 · Updated 2026-03-01 · CVE-2026-21223

Positive Technologies (AI Summary)

CVSS v2.0

7.2

High

Base vector

AV:L/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Microsoft Edge (affected versions not specified)

Description The Microsoft Edge Elevation Service has a design flaw where a privileged COM interface does not properly check the permissions of the process making the request. A standard local user can use the LaunchUpdateCmdElevatedAndWait method of the IElevatorEdge interface to run commands with LocalSystem privileges. This allows a non-administrator to modify protected registry keys under HKLMSYSTEMCurrentControlSetControlDeviceGuard, specifically to disable Windows Virtualization-Based Security (VBS). Disabling VBS reduces the effectiveness of security features like Credential Guard, Hypervisor-protected Code Integrity (HVCI), and the Secure Kernel, leading to a security bypass.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Privilege Management

Weakness Enumeration

CWE-269

Related Identifiers

BDU:2026-00807

CVE-2026-21223

Affected Products

Edge

References · 13

• https://osv.dev/vulnerability/CVE-2026-21223 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-00807 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21223 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-21223 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21223 · Security Note
• https://vuldb.com/?id.341666 · Note
• https://reddit.com/r/Action1/comments/1r18ofk/february_patch_tuesday_overview · Reddit Post
• https://t.me/cveNotify/152790 · Telegram Post
• https://cybersecurity-help.cz/vulnerabilities/121637 · Note
• https://twitter.com/0dayPublishing/status/2013841788600012962 · Twitter Post
• https://twitter.com/vuldb/status/2012296451817353361 · Twitter Post
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-21223 · Note
• https://twitter.com/CVEnew/status/2012303177929081009 · Twitter Post