What is CVE-2026-21522?

CVE-2026-21522 is a medium-severity vulnerability in Microsoft Confcom, 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 Confcom

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)

Published 2026-02-10 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.004 (37.1th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Microsoft Confcom
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, Vendor Advisory)

Frequently asked questions

What is CVE-2026-21522?: CVE-2026-21522 is a medium-severity vulnerability in Microsoft Confcom, 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.