How severe is CVE-2026-21515?

CVE-2026-21515 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-21515 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21515?

CVE-2026-21515 affects Microsoft Azure Iot Central. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21515?

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

Does CVE-2026-21515 have an EU (EUVD) identifier?

Yes. CVE-2026-21515 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25416.

When was CVE-2026-21515 published?

CVE-2026-21515 was published on 2026-04-24 and last updated on 2026-06-17.

CVE-2026-21515

CVE-2026-21515 is a critical-severity vulnerability in Microsoft Azure Iot Central with a CVSS 3.x base score of 9.9. 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: Critical (CVSS 3.x base score 9.9)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25416
Weakness: CWE-200
Affected product: Microsoft Azure Iot Central
Published: 2026-04-24
Last modified: 2026-06-17

Description

Exposure of sensitive information to an unauthorized actor in Azure IOT Central allows an authorized attacker to elevate privileges over a network.

Frequently asked questions

What is CVE-2026-21515?: Exposure of sensitive information to an unauthorized actor in Azure IOT Central allows an authorized attacker to elevate privileges over a network.
How severe is CVE-2026-21515?: CVE-2026-21515 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-21515 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21515?: CVE-2026-21515 affects Microsoft Azure Iot Central. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21515?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-21515 have an EU (EUVD) identifier?: Yes. CVE-2026-21515 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25416.
When was CVE-2026-21515 published?: CVE-2026-21515 was published on 2026-04-24 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21515

Affected products (1)

cpe:2.3:a:microsoft:azure_iot_central:-:*:*:*:*:*:*:*

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