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Full vulnerability report · 2026
CVE-2026-40417High confidence

Microsoft Dynamics 365 Business Central Elevation of Privilege Vulnerability

Microsoft · Microsoft Dynamics 365 Business Central 2024 Release Wave 2

7.8HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-29674

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

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

What

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

Why

The product uses an authentication mechanism to restrict access to specific users or identities, but the mechanism does not sufficiently prove that the claimed identity is correct.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may gain additional privileges.

What

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

Why

The product uses an authentication mechanism to restrict access to specific users or identities, but the mechanism does not sufficiently prove that the claimed identity is correct.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may gain additional privileges.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Weak Authentication → gain additional privileges
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-1390 ↗

CWE-1390: Weak Authentication. The product uses an authentication mechanism to restrict access to specific users or identities, but the mechanism does not sufficiently prove that the claimed identity is correct.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
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

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
Privilege escalationCWE-1390
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2026-1485Microsoft Dynamics 365: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Microsoft Dynamics 365 ausnutzen, um beliebigen Programmcode auszuführen, um seine Privilegien zu erhöhen, und um Informationen offenzulegen.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0588Multiples vulnérabilités dans les produits Microsoft

mai 2026 Bulletin de sécurité Microsoft CVE-2026-32185 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-33110 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-33112 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-35439 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-40357 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-40365 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-40367 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-40368 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-40370 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-40374 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-40417 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-41094 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-41103 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-41109 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-41610 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-41611 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-41612 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-41613 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-41614 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-42833 du 12 mai 2026 Bulletin de sécurité Microsoft CVE-2026-42898 du 12 mai 2026 Une gestion de version d

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-017869マイクロソフトのDynamics 365 Business Centralにおける弱い認証に関する脆弱性

Dynamics Business Centralの認証機能に脆弱性があり、認可された攻撃者がローカルで権限を昇格させることが可能です。

Official advisory ↗
NCSC-NL · Dutch · NCSC-2026-0145Kwetsbaarheden verholpen in Microsoft Dynamics

Een geauthenticeerde kwaadwillende kan de kwetsbaarheden misbruiken om zich verhoogde rechten toe te kennen, willekeurige code uit te voeren en/of toegang te krijgen tot gevoelige gegevens. De kwetsbaarheid met kenmerk CVE-2026-33821 is reeds centraal verholpen door Microsoft en slechts toegevoegd ter informatie. Er zijn geen acties benodigd voor deze kwetsbaarheid. ``` Dynamics Business Central: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-40417 | 7.80 | Verkrijgen van verhoogde rechten | |----------------|------|-------------------------------------| Microsoft Dynamics 365 (on-premises): |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-42898 | 9.90 | Uitvoeren van willekeurige code | | CVE-2026-42833 | 9.10 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------| Power Automate: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-40374 | 6.50 | Toegang tot gevoelige gegevens | |----------------|------|-------------------------------------| Microsoft Dynamics 365 Customer Insights: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-33821 | 7.70 | Verkrijgen van verhoogde rechten | |----------------|------|-------------------------------------| ```

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 12 May 2026 · Last source change 10 Aug 2026, 15:14 UTC · CWE-1390 · Weak Authentication

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-29674
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2026-29674↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-40417 · cve.blacktree.nl