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CVE-2026-65815: Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability

highCVSS 8.8CVE-2026-65815
Deserialization of untrusted data in Microsoft Dynamics 365 (on-premises) allows an authorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoftproduct: Dynamics 365 On-PremisesRemote code executionUnsafe deserialization
What
Unsafe deserialization of untrusted data in Microsoft Dynamics 365 on-premises allows authorized attackers to execute code remotely.
Who is affected
Organizations running Dynamics 365 on-premises with authenticated users are affected.
Urgency
High severity (CVSS 8.8) requiring prior authorization; patch immediately to prevent insider attacks.
Action
Apply the latest security update for Dynamics 365 on-premises addressing CVE-2026-65815.

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

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 8.8
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65815

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-65815coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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