Local privilege escalation via weak authentication
Published May 12, 2026 · Updated May 12, 2026
Weak authentication in Microsoft Dynamics 365 Business Central allows local users with low privileges to elevate privileges. Microsoft has not disclosed the affected authentication component or the operation that inadequately verifies the claimed identity. The attack requires existing low-privilege local access and no user interaction; successful exploitation compromises confidentiality, integrity, and availability.
Summary
What happened
Weak authentication in Microsoft Dynamics 365 Business Central allows local users with low privileges to elevate privileges. Microsoft has not disclosed the affected authentication component or the operation that inadequately verifies the claimed identity. The attack requires existing low-privilege local access and no user interaction; successful exploitation compromises confidentiality, integrity, and availability.
The record
- CVE
- CVE-2026-40417
- Published
- May 12, 2026
- Updated
- May 12, 2026
- Vendor
- Microsoft
- Product
- Dynamics 365 Business Central 2025 Release Wave 2
- Classifications
- CWE-1390, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 12, 2026CVE publishedPublication date reported by the CVE source.
- May 12, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=27.0 <27.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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