Security readout for executives and security teams
Plain-English summary
An authenticated user with limited local access to an affected Microsoft Dynamics 365 Business Central system could gain higher privileges. Successful abuse could expose or alter sensitive business data and disrupt operations. The issue is rated high severity, but the supplied sources do not establish active exploitation.
Executive priority
Prioritize remediation promptly because successful abuse could give an existing user broad control over business data and service availability. Treat internet exposure as secondary to insider, compromised-account, and shared-host risks. Request an inventory and patch-status report, while avoiding assumptions about fixed builds not included in the supplied bundle.
Technical view
CVE-2026-40417 is a weak-authentication elevation-of-privilege vulnerability, classified as CWE-1390. It requires local access and low privileges, needs no user interaction, and has low attack complexity. Microsoft assigns CVSS 3.1 score 7.8, with high potential impact to confidentiality, integrity, and availability.
Likely exposure
Exposure is limited to listed Business Central versions 25.0, 26.0, 27.0, and 28.0. Risk is greatest where authorized low-privilege users have local access. The bundle does not identify affected deployment models, configurations, or fixed build numbers.
Exploitation context
The CVSS vector indicates a local, authenticated attack rather than unauthenticated remote compromise. CISA KEV status is false, and the supplied sources provide no evidence of active exploitation or public exploit availability. Absence from KEV does not prove exploitation has never occurred.
Researcher notes
Assessment is constrained to the supplied CVE record and Microsoft advisory reference. The bundle identifies weak authentication but does not describe the vulnerable component, privilege boundary, affected configurations, fixed builds, telemetry, or detection indicators. Validate those details directly against Microsoft guidance without attempting exploitation in production.
Mitigation direction
- Inventory Business Central installations and identify versions 25.0 through 28.0.
- Review Microsoft’s CVE advisory for applicable fixed builds and deployment instructions.
- Apply Microsoft’s applicable security update using normal change-control procedures.
- Restrict unnecessary local access and review low-privilege account assignments until remediation is confirmed.
Validation and detection
- Confirm installed Business Central versions and exact build numbers on every deployment.
- Compare each build against Microsoft’s current CVE advisory and update guidance.
- Verify applicable updates installed successfully across production and recovery environments.
- Review privileged-role changes and unusual local account activity for affected systems.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-1390: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-40417 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C1.85.9microsoftVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Microsoft Dynamics 365 Business Central Elevation of Privilege VulnerabilityCVE reference, microsoft · vendor-advisory, patch
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Weak Authentication
Weak Authentication represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.