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CVE-2026-55944Critical

Microsoft Dynamics NAV and Microsoft Dynamics 365 Business Central (On Premises) Remote Code Execution Vulnerability

MSRC advisory NVD CVE.org

Assessment

Deserialization of untrusted data in Microsoft Dynamics NAV allows an unauthorized attacker to execute code over a network.

Severity
Critical
CVSS base score
9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Impact
Remote Code Execution
EPSS, next 30 days
1.5%Higher than 73.8% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
Exploitability
Exploitation More Likely
Publicly disclosed
No
Customer action
Required: apply the update
Component
Microsoft Dynamics NAV
Weakness
CWE-502: Deserialization of Untrusted Data
Issued by
Microsoft
Published
14 Jul 2026 · July 2026
Last revised
14 Jul 2026

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

Microsoft Dynamics
1 affected product
  • Microsoft Dynamics NAV 2018
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