Critical severity · published Jul 14, 2026
CVE-2026-55944
Microsoft Dynamics NAV and Microsoft Dynamics 365 Business Central (On Premises) Remote Code Execution Vulnerability
9.8
CVSS
1.5%
EPSS
No
On KEV
Description
Deserialization of untrusted data in Microsoft Dynamics NAV allows an unauthorized attacker to execute code over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 75% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MD
Microsoft Dynamics NAV 2018 · Microsoft
1.0 before 11.0.50704.0 · source: vendor
DN
Dynamics Nav · Microsoft
2018 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55944
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55944
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55944
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