What is CVE-2026-21522?

CVE-2026-21522 is a medium-severity vulnerability in Microsoft Aci Confidential Containers, classified under Command Injection. CVSS score: 6.7/10. Published 2026-02-10.

How severe is CVE-2026-21522?

Medium severity. CVSS v3 base score is 6.7 out of 10.

RCE in Microsoft Aci Confidential Containers

CVE-2026-21522

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

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.000 (14.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). 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.

Affected products

Microsoft Aci Confidential Containers — versions 1.0.0

Weakness classification (CWE)

CWE-77 — Command Injection

References

Microsoft ACI Confidential Containers Elevation of Privilege Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-21522?: CVE-2026-21522 is a medium-severity vulnerability in Microsoft Aci Confidential Containers, classified under Command Injection. CVSS score: 6.7/10. Published 2026-02-10.
How severe is CVE-2026-21522?: Medium severity. CVSS v3 base score is 6.7 out of 10.