MSRC-CVE-2026-85891 — Azure HDInsight Information Disclosure Vulnerability

Summary

Impact: Information Disclosure. Microsoft rating: Important. Not known to be exploited. Customer action: Required.

Details

What type of information could be disclosed by this vulnerability?
The type of information that could be disclosed if an attacker successfully exploited this vulnerability is sensitive information.

Security updates
2606012120 — https://learn.microsoft.com/en-us/azure/hdinsight/hdinsight-release-notes

Vulnerabilities 1

High 7.5

CVE-2026-85891

Azure HDInsight Information Disclosure Vulnerability

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

Microsoft Azure HDInsight

Oct 13, 2026

Revision history

2026-10-13 #1
Information published.

References

CVE-2026-85891 Azure HDInsight Information Disclosure Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85891
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss