{"id":997926,"date":"2026-07-22T10:10:57","date_gmt":"2026-07-22T10:10:57","guid":{"rendered":"https:\/\/ioi.gmbh\/?p=997926"},"modified":"2026-08-31T15:03:11","modified_gmt":"2026-08-31T15:03:11","slug":"cve-2026-55944-critical-security-vulnerability-microsoft-dynamics-nav-act-now","status":"publish","type":"post","link":"https:\/\/ioi.gmbh\/en\/2026\/07\/22\/cve-2026-55944-critical-security-vulnerability-microsoft-dynamics-nav-act-now\/","title":{"rendered":"CVE-2026-55944: Critical Security Vulnerability in Microsoft Dynamics NAV &#8211; Act Now"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>A newly published security vulnerability in Microsoft Dynamics NAV calls for immediate action. Attackers can exploit the flaw over the network without signing in and without any user having to click or confirm anything. Affected installations should be updated without delay. This is also the right moment to start the permanent move to the Business Central cloud.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On 14 July 2026, Microsoft published the critical vulnerability CVE-2026-55944. It is caused by the unsafe processing of untrusted data. As a result, an unauthenticated attacker can execute code over the network on an affected Dynamics NAV server. <strong>The CVSS score is 9.8 out of 10.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">According to the published information, a specially crafted login request can be enough to exploit the vulnerability. No prior sign-in is required. Nor does it need any action by an employee, such as opening an attachment or clicking a link.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That sets CVE-2026-55944 apart from many classic phishing or malware attacks. A reachable, unpatched server can be attacked directly.<\/p>\n\n\n\n<h2 id=\"h-die-wichtigsten-fakten-zu-cve-2026-55944\" class=\"wp-block-heading\">The key facts about CVE-2026-55944<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Severity:<\/strong> Critical<br><strong>CVSS score:<\/strong> 9.8 out of 10<br><strong>Attack vector:<\/strong> Over the network<br><strong>Sign-in required:<\/strong> No<br><strong>User interaction required:<\/strong> No<br><strong>Possible impact:<\/strong> Execution of arbitrary code on the affected system<br><strong>Cause:<\/strong> Deserialization of untrusted data, CWE-502<br><strong>Affected versions:<\/strong> Microsoft Dynamics NAV below version 11.0.50704.0 (all versions, for example NAV2009 &#8211; NAV2017, are affected)<br><strong>Patched version:<\/strong> 11.0.50704.0 or newer<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This rating means that an attack can be carried out remotely, has low attack complexity and requires no existing user permissions. The possible impact on confidentiality, integrity and availability is rated high in each case.<\/p>\n\n\n\n<h2 id=\"h-welche-systeme-sind-betroffen\" class=\"wp-block-heading\">Which systems are affected?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In its official list of affected products, Microsoft currently names Microsoft Dynamics NAV in versions from 1.0 up to but not including 11.0.50704.0.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Do not rely on the product name shown in the client alone. What matters is the specific build version of the installed server components.<\/p>\n\n\n\n<h2 id=\"h-warum-ist-diese-sicherheitslucke-so-gefahrlich\" class=\"wp-block-heading\">Why is this vulnerability so dangerous?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In many attacks, a user first has to open a link, run an attachment or enter their credentials on a fake page. CVE-2026-55944 requires no such preparatory steps.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">According to the CVSS rating, an attacker needs:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>no valid NAV credentials,<\/li>\n\n\n\n<li>no existing user permissions,<\/li>\n\n\n\n<li>no interaction from an employee,<\/li>\n\n\n\n<li>and no local access to the server.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If the attacker can reach the vulnerable service over the network, a crafted request can lead to code execution. Microsoft rates both the possible loss of confidentiality and the impact on data integrity and system availability as high.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For an ERP system, this is particularly serious.<\/strong> Dynamics NAV is often closely tied to financial accounting, inventory management, production, purchasing, sales and other business-critical processes. A compromised server can therefore have consequences well beyond a single technical service.<\/p>\n\n\n\n<h2 id=\"h-was-unternehmen-jetzt-tun-mussen\" class=\"wp-block-heading\">What companies need to do now<\/h2>\n\n\n\n<h3 id=\"h-1-installierte-build-version-feststellen\" class=\"wp-block-heading\">1. Determine the installed build version<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Check without delay which Dynamics NAV version is installed on all server instances. What counts is not only the version of the Windows client, but above all the version of the server components in use.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the version is below 11.0.50704.0, Microsoft considers the installation to be affected by CVE-2026-55944.<\/p>\n\n\n\n<h3 id=\"h-2-sicherheitsupdate-sofort-einspielen\" class=\"wp-block-heading\">2. Apply the security update immediately<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Affected systems have to be updated to version 11.0.50704.0 or a newer, patched version. Before you install it, check whether the update touches any custom modifications, Add-ons or connected systems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A migration project that is under way or planned is no reason to postpone the update. Even if the cloud migration has already started, the existing NAV environment has to stay protected until it is finally switched off.<\/p>\n\n\n\n<h3 id=\"h-3-erreichbarkeit-der-nav-dienste-kontrollieren\" class=\"wp-block-heading\">3. Review how the NAV services can be reached<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Check which networks the affected services can be reached from. External access that is not needed should be restricted or blocked temporarily. Pay particular attention to systems that are reachable directly or indirectly over the internet.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Restricting access does not replace the security update. It can, however, reduce the risk until the update has been applied.<\/p>\n\n\n\n<h3 id=\"h-4-protokolle-und-serververhalten-uberprufen\" class=\"wp-block-heading\">4. Check logs and server behaviour<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Review server and application logs for unusual login requests, unexpected processes, unknown user accounts, modified files or suspicious network connections.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You should also check whether current backups exist that are kept separately and can actually be restored.<\/p>\n\n\n\n<h3 id=\"h-5-wechsel-aus-der-altversion-verbindlich-starten\" class=\"wp-block-heading\">5. Commit to moving off the legacy version<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The patch closes the vulnerability that is currently known. It does not solve the underlying problem of an older on-premises installation, where updates, operating systems, SQL Server, custom extensions and external interfaces all have to be maintained by you on an ongoing basis.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CVE-2026-55944 should therefore not be treated as an isolated technical incident. The security advisory is a concrete reason to carry out a modernisation that has been put off for some time.<\/p>\n\n\n\n<h2 id=\"h-patchen-oder-migrieren-die-antwort-lautet-beides\" class=\"wp-block-heading\">Patch or migrate? The answer is: both<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In the short term, the affected NAV version has to be updated. There is no responsible way around it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At the same time, you should review whether continuing to run an older NAV infrastructure still makes sense. When you move to Business Central Online, updates are delivered continuously through the cloud service. Administrators can define maintenance windows and schedule updates within the periods provided. That removes the familiar upgrade backlog in which companies stay on an old major version for years.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A cloud solution is not inherently free of security risks either. The operating model does change considerably, though: the underlying platform and the regular delivery of updates are no longer organised entirely in your own server environment.<\/p>\n\n\n\n<h2 id=\"h-innerhalb-von-zwei-bis-vier-wochen-zu-business-central-cloud\" class=\"wp-block-heading\">To Business Central Cloud within two to four weeks<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">With DataMigrate Pro, IO Integrated enables direct migration from Dynamics NAV, Navision and older Business Central versions to the latest Microsoft Dynamics 365 Business Central version.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike a classic technical upgrade, the database does not have to be raised step by step through several so-called jump versions. The data can be transferred directly into the new Business Central environment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DataMigrate Pro supports, among other things:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>master data and setup data,<\/li>\n\n\n\n<li>open and posted documents,<\/li>\n\n\n\n<li>G\/L, customer and vendor ledger entries,<\/li>\n\n\n\n<li>custom tables and fields,<\/li>\n\n\n\n<li>delta migrations and follow-up synchronisations,<\/li>\n\n\n\n<li>parallel operation of NAV and Business Central,<\/li>\n\n\n\n<li>and a switch you can plan with minimal interruption to operations.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Depending on data volume, customisations, Add-ons and organisational preparation, the switch with DataMigrate Pro can be completed within two to four weeks. Your existing NAV environment and Business Central can run in parallel during the migration, and data can be synchronised repeatedly.<\/p>\n\n\n\n<h2 id=\"h-warum-jetzt-der-richtige-zeitpunkt-fur-den-wechsel-ist\" class=\"wp-block-heading\">Why now is the right time to switch<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Many companies still run Dynamics NAV reliably in day-to-day business. That is often exactly why a migration keeps being postponed. As long as the system works, there seems to be little pressure to act.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CVE-2026-55944 shows how quickly that assessment can change.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With every additional year, dependencies on older server operating systems, SQL versions, custom modifications and unmaintained extensions typically increase. At the same time, it becomes harder to respond to new security requirements at short notice.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A planned migration is almost always better than a changeover forced through under time pressure after a security incident.<\/p>\n\n\n\n<h2 id=\"h-jetzt-nav-absichern-und-cloud-migration-starten\" class=\"wp-block-heading\">Secure NAV now and start the cloud migration<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Do you run Microsoft Dynamics NAV 2018 (or earlier), or are you unsure about your build version?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then you should act now:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Have your installed version checked, apply the required security update, and start the migration to Business Central Cloud alongside it. With DataMigrate Pro, the direct switch can be done within two to four weeks, depending on the scope of the project.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A newly published security vulnerability in Microsoft Dynamics NAV calls for immediate action. Attackers can exploit the flaw over the network without signing in and without any user having to click or confirm anything. Affected installations should be updated without delay. This is also the right moment to start the permanent move to the Business [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":998059,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[39],"tags":[],"class_list":["post-997926","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-products-and-services"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.6 (Yoast SEO v28.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>CVE-2026-55944: Critical Security Vulnerability in Microsoft Dynamics NAV - Act Now | IOI<\/title>\n<meta name=\"description\" content=\"This critical vulnerability affects all Dynamics NAV versions and poses a high risk. 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