CVE-2026-40371: Microsoft Dynamics 365 (on-premises) Elevation of Privilege Vulnerability

highCVSS 8.8CVE-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.

CSIRTS triage

vendor: Microsoft product: Dynamics 365 Privilege escalation

What: Improper handling of insufficient permissions in Microsoft Dynamics 365 allows an authorized attacker to elevate privileges over a network.
Who is affected: Users of Microsoft Dynamics 365 (on-premises).
Urgency: Remediation is important but not urgent as there is no active exploitation reported.
Action: Update Microsoft Dynamics 365 to the latest version to address the vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Dynamics 365

Get an email when a new Dynamics 365 advisory drops — max one per day, one-click unsubscribe.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 8.8
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

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

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-403710.63% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 46% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-40371	coverage & exploitation status	NVD · CVE.org

Recent advisories for Microsoft Dynamics

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[UPDATE] [high] Microsoft Dynamics 365: Vulnerability allows Cross-Site Scriptingcert-bund · 2026-07-09