How severe is CVE-2026-40417?

CVE-2026-40417 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-40417 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40417?

CVE-2026-40417 primarily affects Microsoft Dynamics 365 Business Central. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-40417?

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-2026-40417 have an EU (EUVD) identifier?

Yes. CVE-2026-40417 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29674.

When was CVE-2026-40417 published?

CVE-2026-40417 was published on 2026-05-12 and last updated on 2026-06-17.

CVE-2026-40417

CVE-2026-40417 is a high-severity vulnerability in Microsoft Dynamics 365 Business Central with a CVSS 3.x base score of 7.8. 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-1390.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29674
Weakness: CWE-1390
Affected product: Microsoft Dynamics 365 Business Central
Published: 2026-05-12
Last modified: 2026-06-17

Description

Weak authentication in Dynamics Business Central allows an authorized attacker to elevate privileges locally.

Frequently asked questions

What is CVE-2026-40417?: Weak authentication in Dynamics Business Central allows an authorized attacker to elevate privileges locally.
How severe is CVE-2026-40417?: CVE-2026-40417 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-40417 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40417?: CVE-2026-40417 primarily affects Microsoft Dynamics 365 Business Central. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-40417?: 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-2026-40417 have an EU (EUVD) identifier?: Yes. CVE-2026-40417 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29674.
When was CVE-2026-40417 published?: CVE-2026-40417 was published on 2026-05-12 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40417

Affected products (4)

cpe:2.3:a:microsoft:dynamics_365_business_central:2024:release_wave_2:*:*:*:*:*:*
cpe:2.3:a:microsoft:dynamics_365_business_central:2025:release_wave_1:*:*:*:*:*:*
cpe:2.3:a:microsoft:dynamics_365_business_central:2025:release_wave_2:*:*:*:*:*:*
cpe:2.3:a:microsoft:dynamics_365_business_central:2026:release_wave_1:*:*:*:*:*:*

More vulnerabilities in Microsoft Dynamics 365 Business Central

CVE-2024-38225 — High (CVSS 8.8): Microsoft Dynamics 365 Business Central Elevation of Privilege Vulnerability
CVE-2024-35249 — High (CVSS 8.8): Microsoft Dynamics 365 Business Central Remote Code Execution Vulnerability
CVE-2022-41127 — High (CVSS 8.5): Microsoft Dynamics NAV and Microsoft Dynamics 365 Business Central (On Premises) Remote Code Execution Vulnerability
CVE-2024-43460 — High (CVSS 8.1): Improper authorization in Dynamics 365 Business Central resulted in a vulnerability that allows an authenticated…
CVE-2024-21380 — High (CVSS 8.0): Microsoft Dynamics Business Central/NAV Information Disclosure Vulnerability
CVE-2021-34474 — High (CVSS 8.0): Dynamics Business Central Remote Code Execution Vulnerability

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