How severe is CVE-2026-40371?

CVE-2026-40371 has a CVSS 3.x base score of 8.8, rated high 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-2026-40371 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40371?

CVE-2026-40371 affects Microsoft Dynamics 365. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40371?

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-2026-40371 have an EU (EUVD) identifier?

Yes. CVE-2026-40371 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35532.

When was CVE-2026-40371 published?

CVE-2026-40371 was published on 2026-06-09 and last updated on 2026-06-17.

CVE-2026-40371

CVE-2026-40371 is a high-severity vulnerability in Microsoft Dynamics 365 with a CVSS 3.x base score of 8.8. 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-755.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-35532
Weakness: CWE-755
Affected product: Microsoft Dynamics 365
Published: 2026-06-09
Last modified: 2026-06-17

Description

Improper handling of insufficient permissions or privileges in Microsoft Dynamics 365 (on-premises) allows an authorized attacker to elevate privileges over a network.

Frequently asked questions

What is CVE-2026-40371?: Improper handling of insufficient permissions or privileges in Microsoft Dynamics 365 (on-premises) allows an authorized attacker to elevate privileges over a network.
How severe is CVE-2026-40371?: CVE-2026-40371 has a CVSS 3.x base score of 8.8, rated high 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-2026-40371 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40371?: CVE-2026-40371 affects Microsoft Dynamics 365. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40371?: 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-2026-40371 have an EU (EUVD) identifier?: Yes. CVE-2026-40371 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35532.
When was CVE-2026-40371 published?: CVE-2026-40371 was published on 2026-06-09 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40371

Affected products (1)

cpe:2.3:a:microsoft:dynamics_365:*:*:*:*:on-premises:*:*:*

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