CVE-2026-55944 Microsoft Dynamics NAV and Microsoft Dynamics 365 Business Central (On Premises) Remote Code Execution Vulnerability
An unauthorized attacker can execute arbitrary code remotely by exploiting a deserialization flaw in Microsoft Dynamics NAV and Business Central.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-55944?
CVE-2026-55944 is a critical unsafe deserialization vulnerability in Microsoft Dynamics NAV 2018, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Deserialization of untrusted data in Microsoft Dynamics NAV allows an unauthorized attacker to execute code over a network.
Weakness: CWE-502
Which versions are affected by CVE-2026-55944?
It affects 1 product.
Products include Microsoft Dynamics Nav.
How do I fix CVE-2026-55944?
No fix has been published for CVE-2026-55944 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-55944 being exploited?
There is no known exploitation of CVE-2026-55944 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Microsoft Dynamics NAV 2018
Sources
Also known as GHSA-rvmx-r962-429w.