CVE-2026-21522: Microsoft ACI Confidential Containers Elevation of Privilege Vulnerability

Overview

Severity
Medium (CVSS 6.7)
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
Category
Elevation of Privilege
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Patch Tuesday
2026-Feb
Released
2026-02-10
EPSS Score
0.04% (percentile: 13.5%)

Description

Improper neutralization of special elements used in a command ('command injection') in Azure Compute Gallery allows an authorized attacker to elevate privileges locally.

FAQ

What privileges could be gained by an attacker who successfully exploited the vulnerability? An attacker who exploited this vulnerability could execute arbitrary commands within the affected ACI container’s context, allowing them to run code with the same privileges as the compromised container. In confidential‑container scenarios, this could also let an attacker access sensitive secrets or data protected by the attested environment.

Affected Products (1)

Azure

  • Microsoft ACI Confidential Containers

Security Updates (1)

Acknowledgments

<a href="https://x.com/yuvalavra">Yuval Avrahami</a>

Revision History

  • 2026-02-10: Information published.