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CVE-2026-55944 is a critical remote code execution vulnerability in Microsoft Dynamics NAV and Microsoft Dynamics 365 Business Central on-premises caused by deserialization of untrusted data. The flaw can be triggered by sending a crafted login request to an affected server, causing unsafe deserialization during request processing. The vulnerability is reachable over the network and does not require authentication or user interaction, making it a pre-authentication attack surface in exposed deployments.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical unauthenticated remote code execution vulnerability in Microsoft Dynamics NAV and Microsoft Dynamics 365 Business Central (on premises) triggered via a crafted login request causing deserialization of untrusted data.
A deserialization remote code execution vulnerability affecting Microsoft Dynamics NAV and Microsoft Dynamics 365 Business Central (on-premises).
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.