What is CVE-2026-21529?

CVE-2026-21529 is a medium-severity vulnerability in Microsoft Azure Hdinsight, classified under Cross-site Scripting. CVSS score: 5.7/10. Published 2026-02-10.

How severe is CVE-2026-21529?

Medium severity. CVSS v3 base score is 5.7 out of 10.

XSS in Microsoft Azure Hdinsight

CVE-2026-21529

Improper neutralization of input during web page generation ('cross-site scripting') in Azure HDInsights allows an authorized attacker to perform spoofing over a network.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (14.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C.

Affected products

Microsoft Azure Hdinsight — versions 1.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Azure HDInsight Spoofing Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-21529?: CVE-2026-21529 is a medium-severity vulnerability in Microsoft Azure Hdinsight, classified under Cross-site Scripting. CVSS score: 5.7/10. Published 2026-02-10.
How severe is CVE-2026-21529?: Medium severity. CVSS v3 base score is 5.7 out of 10.