What is CVE-2026-21515?

CVE-2026-21515 is a critical-severity vulnerability in Microsoft Azure Iot Central, classified under Information Disclosure. CVSS score: 9.9/10. Published 2026-04-24.

How severe is CVE-2026-21515?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Information disclosure in Microsoft Azure Iot Central

CVE-2026-21515

Exposure of sensitive information to an unauthorized actor in Azure IOT Central allows an authorized attacker to elevate privileges over a network.

Vulnerability class: Information Disclosure

Published 2026-04-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (51.5th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

Azure IoT Central Elevation of Privilege Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-21515?: CVE-2026-21515 is a critical-severity vulnerability in Microsoft Azure Iot Central, classified under Information Disclosure. CVSS score: 9.9/10. Published 2026-04-24.
How severe is CVE-2026-21515?: Critical severity. CVSS v3 base score is 9.9 out of 10.