SB2026011386 - Multiple vulnerabilities in Microsoft Tablet Windows User Interface (TWINUI) Subsystem

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Race condition (CVE-ID: CVE-2026-20826)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a race condition in Tablet Windows User Interface (TWINUI) Subsystem. A local user can exploit the race and escalate privileges on the system.

2) Information disclosure (CVE-ID: CVE-2026-20827)

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application in Tablet Windows User Interface (TWINUI) Subsystem. A local user can gain unauthorized access to sensitive information on the system.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20826
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20827