CVE-2026-21529
CVE-2026-21529 is a medium-severity vulnerability in Microsoft Azure Hdinsight with a CVSS 3.x base score of 5.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 3.x base score 5.7)
- EPSS exploit prediction: 1% (45th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-7335
- Weakness: CWE-79
- Affected product: Microsoft Azure Hdinsight
- Published:
- Last modified:
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.
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 3.x base score of 5.7, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2026-21529 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-21529?
- CVE-2026-21529 affects Microsoft Azure Hdinsight. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-21529?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-21529 have an EU (EUVD) identifier?
- Yes. CVE-2026-21529 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7335.
- When was CVE-2026-21529 published?
- CVE-2026-21529 was published on 2026-02-10 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:microsoft:azure_hdinsight:*:*:*:*:*:*:*:*
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