What is CVE-2026-21524?

CVE-2026-21524 is a high-severity vulnerability in Microsoft Azure Data Explorer, classified under Information Disclosure. CVSS score: 7.4/10. Published 2026-01-22.

How severe is CVE-2026-21524?

High severity. CVSS v3 base score is 7.4 out of 10.

Information disclosure in Microsoft Azure Data Explorer

CVE-2026-21524

Exposure of sensitive information to an unauthorized actor in Azure Data Explorer allows an unauthorized attacker to disclose information over a network.

Vulnerability class: Information Disclosure

Published 2026-01-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (46.8th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001

Affected products

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

Azure Data Explorer Information Disclosure Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-21524?: CVE-2026-21524 is a high-severity vulnerability in Microsoft Azure Data Explorer, classified under Information Disclosure. CVSS score: 7.4/10. Published 2026-01-22.
How severe is CVE-2026-21524?: High severity. CVSS v3 base score is 7.4 out of 10.