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CVE-2026-55944: Microsoft Dynamics NAV and Microsoft Dynamics 365 Business Central (On Premises) Remote Code Execution Vulnerability

criticalCVSS 9.8CVE-2026-55944
Deserialization of untrusted data in Microsoft Dynamics NAV allows an unauthorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoftproduct: Dynamics NAV and Dynamics 365 Business CentralRemote code execution
What
Deserialization of untrusted data in Dynamics NAV allows unauthorized remote code execution.
Who is affected
Users of Microsoft Dynamics NAV and Dynamics 365 Business Central are affected.
Urgency
Remediation is urgent due to the critical nature of the vulnerability and its high CVSS score.
Action
Apply the security update for CVE-2026-55944 as soon as possible.

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
critical — CVSS 9.8
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55944

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-2026-55944coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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