How severe is CVE-2026-21524?

CVE-2026-21524 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-21524 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21524?

CVE-2026-21524 affects Microsoft Azure Data Explorer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21524?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-21524 have an EU (EUVD) identifier?

Yes. CVE-2026-21524 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4501.

When was CVE-2026-21524 published?

CVE-2026-21524 was published on 2026-01-22 and last updated on 2026-06-17.

CVE-2026-21524

CVE-2026-21524 is a high-severity vulnerability in Microsoft Azure Data Explorer with a CVSS 3.x base score of 7.4. 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-200.

Key facts

Severity: High (CVSS 3.x base score 7.4)
EPSS exploit prediction: 1% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-4501
Weakness: CWE-200
Affected product: Microsoft Azure Data Explorer
Published: 2026-01-22
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2026-21524?: Exposure of sensitive information to an unauthorized actor in Azure Data Explorer allows an unauthorized attacker to disclose information over a network.
How severe is CVE-2026-21524?: CVE-2026-21524 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-21524 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21524?: CVE-2026-21524 affects Microsoft Azure Data Explorer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21524?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-21524 have an EU (EUVD) identifier?: Yes. CVE-2026-21524 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4501.
When was CVE-2026-21524 published?: CVE-2026-21524 was published on 2026-01-22 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21524

Affected products (1)

cpe:2.3:a:microsoft:azure_data_explorer:-:*:*:*:*:*:*:*

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