SB2026021083 - Multiple vulnerabilities in Microsoft ACI Confidential Containers

Description

This security bulletin contains information about 2 vulnerabilities.

1) Cleartext storage of sensitive information (CVE-ID: CVE-2026-23655)

CWE-ID: CWE-312 - Cleartext Storage of Sensitive Information

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to cleartext storage of sensitive information in Microsoft ACI Confidential Containers. A remote user can gain access to secret tokens and keys.

2) Command Injection (CVE-ID: CVE-2026-21522)

CWE-ID: CWE-77 - Command injection

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to execute arbitrary commands on the system.

The vulnerability exists due to insufficient input validation in Microsoft ACI Confidential Containers. A local administrator can pass specially crafted data to the application and execute arbitrary commands with elevated privileges.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23655
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21522