What is CVE-2026-21529?

CVE-2026-21529 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Azure HDInsight Spoofing Vulnerability

Which CVE IDs does CVE-2026-21529 cover?

CVE-2026-21529 covers the following CVE IDs: CVE-2026-21529. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-21529?

CVE-2026-21529 has a CVSS v3 base score of 5.7, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-21529?

CVE-2026-21529 affects 1 product, including: Azure HDInsight.

CVE-2026-21529HighCVSS 5.7

Azure HDInsight Spoofing Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

February 10, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-21529 →

📋 Description

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

🎯 Affected products1

Azure HDInsight

✅ Remediation

KBRelease Notes (Security Update) — fixed build 5.1

🔗 References (4)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21529
patchhttps://hdiconfigactions.blob.core.windows.net/ambari-patch-100765/patch-script.sh
referencehttps://docs.azure.cn/en-us/hdinsight/hdinsight-release-notes
patchhttps://hdiconfigactions.blob.core.windows.net/ambari-patch-100765/ambari_ui_patch_5files.tar.gz