CVE-2026-55944Network attack vector

Unauthenticated code execution via untrusted deserialization

Published Jul 14, 2026 · Updated Jul 14, 2026

Untrusted deserialization in Microsoft Dynamics NAV 2018 before 11.0.50704.0 allows remote attackers to execute code over a network. Microsoft identifies the flaw only as deserialization of untrusted data and does not disclose the receiving component, format, or unsafe operation. No credentials or user interaction are required; successful exploitation executes attacker-controlled code with full application impact.

CVSS severity9.8
Critical
EPSS probability1.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Untrusted deserialization in Microsoft Dynamics NAV 2018 before 11.0.50704.0 allows remote attackers to execute code over a network. Microsoft identifies the flaw only as deserialization of untrusted data and does not disclose the receiving component, format, or unsafe operation. No credentials or user interaction are required; successful exploitation executes attacker-controlled code with full application impact.

The record

CVE
CVE-2026-55944
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Microsoft
Product
Microsoft Dynamics NAV 2018
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0 <11.0.50704.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Dynamics NAV 2018version=1.0 <11.0.50704.0

Published CVSS scores

9.8Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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