CVE-2026-21529

Name: CVE-2026-21529
Creator: NVD / NIST
Published: 2026-02-10T18:16:35.433+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.62%

Last modified Jun 17, 2026

CVE-2026-21529 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Improper neutralization of input during web page generation ('cross-site scripting') in Azure HDInsights allows an authorized attacker to perform spoofing over a network.. EPSS estimates a 0.62% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.62%

45.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Microsoft	Azure Hdinsight	< 5.1

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21529Vendor Advisory

Timeline

Published: Feb 10, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is 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.

How severe is CVE-2026-21529?

CVE-2026-21529 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.62% probability of exploitation in the next 30 days.

How do I fix CVE-2026-21529?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-21529?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST