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

CVE-2026-21529 has a CVSS 3.1 base score of 5.7 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of Azure are affected by CVE-2026-21529?

CVE-2026-21529 presents moderate security risk, a cross-site scripting vulnerability rated CVSS 5.7. Attackers could inject scripts to steal sessions or perform actions as authenticated users.. A patch is available.

How to fix or mitigate CVE-2026-21529?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Azure CVE-2026-21529

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-02-10 secure@microsoft.com

Azure XSS Azure Hdinsight

5.7

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.7 MEDIUM

AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:02 vuln.today

CVE Published

Feb 10, 2026 - 18:16 nvd

MEDIUM 5.7

DescriptionCVE.org

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

AnalysisAI

Azure HDInsight contains a cross-site scripting (XSS) vulnerability in web page generation that allows authenticated attackers to conduct spoofing attacks over the network. An attacker with valid credentials and user interaction can exploit this weakness to manipulate web content and deceive users. No patch is currently available for this issue.

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Azure Hdinsight. Improper neutralization of input during web page generation ('cross-site scripting') in Azure HDInsights allows an authorized attacker to perform spoofing over a network.

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.