CVE-2026-21529 Azure HDInsight Spoofing Vulnerability
An authorized attacker can perform spoofing via cross-site scripting in Azure HDInsight, requiring a patch to mitigate.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-21529?
CVE-2026-21529 is a medium-severity cross-site scripting vulnerability in Microsoft Azure HDInsight, published on 10 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-21529?
It affects 1 product.
Products include Microsoft Azure Hdinsight.
How do I fix CVE-2026-21529?
No fix has been published for CVE-2026-21529 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-21529 being exploited?
There is no known exploitation of CVE-2026-21529 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Azure HDInsight
- CVE-2023-36419 Azure HDInsight Apache Oozie Workflow Scheduler XXE Elevation of Privilege Vulnerability
- CVE-2026-81349 Azure HDInsight Ambari Elevation of Privilege Vulnerability
- CVE-2023-38156 Azure HDInsight Apache Ambari JDBC Injection Elevation of Privilege Vulnerability
- CVE-2023-35394 Azure HDInsight Jupyter Notebook Spoofing Vulnerability
- CVE-2023-35393 Azure Apache Hive Spoofing Vulnerability
Sources
Also known as GHSA-8754-7pfj-x7mr.