Microsoft Ships KB5078752 for Windows 10 1809 and Server 2019
The cumulative update brings affected systems to build 17763.8511 and fixes multiple privilege-escalation and remote code execution vulnerabilities.
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Key takeaways
- KB5078752 is the March 10, 2026 cumulative security update for Windows 10 1809 and Windows Server 2019.
- It brings affected systems to build 17763.8511.
- Fixes cover Windows Kernel, Remote Desktop Services, Graphics/DirectWrite, CLFS and Print Spooler vulnerabilities.
- A system restart is required to complete installation.
- Known issues include install failure on low disk space (0x80070070) and possible legacy app compatibility problems.
What to do now
High urgency- Test KB5078752 in a non-production environment, then deploy across affected systems.
- Ensure at least 2 GB of free disk space to avoid error 0x80070070.
- Verify build 17763.8511 after the required restart.
Microsoft released KB5078752, a cumulative security update for Windows 10 Version 1809 and Windows Server 2019, on March 10, 2026. The update raises the operating system build to 17763.8511 and addresses multiple vulnerabilities spanning the Windows Kernel, Remote Desktop Services, Windows Graphics components, the Common Log File System (CLFS) and the Print Spooler service.
The vulnerabilities addressed range from local privilege escalation to remote code execution, meaning unpatched systems could be exploited for full compromise. Given the continued enterprise footprint of Server 2019, admins should prioritize testing and deployment.
Microsoft's KB5078752 patches multiple Windows vulnerabilities and updates Windows 10 1809 and Server 2019 to build 17763.8511.
Install KB5078752 to reach build 17763.8511; ensure at least 2 GB free disk space and expect a required restart. Test critical legacy apps before wide deployment.
Affected & context
Microsoft released KB5078752 on March 10, 2026, a cumulative security update for Windows 10 Version 1809 and Windows Server 2019 that raises the OS build to 17763.8511 and addresses multiple vulnerabilities across several Windows components.
Windows Server 2019 remains widely deployed in enterprise environments, and the update patches privilege-escalation and remote code execution flaws that could lead to full system compromise if left unpatched.
Systems running Windows 10 Version 1809 (x86 and x64), Windows Server 2019 and Windows Server 2019 Server Core.
- Vendors
- Microsoft
- Products
- Windows 10 Version 1809Windows Server 2019Windows Server 2019 Server Core
- Geography
- Global
What KB5078752 delivers
Microsoft released KB5078752 on March 10, 2026 as a cumulative security update for Windows 10 Version 1809 and Windows Server 2019. After installation, affected systems report OS build 17763.8511.
The update is classified as a security update and is delivered through Windows Update, the Microsoft Update Catalog, WSUS, Microsoft Configuration Manager (SCCM) and Microsoft Intune. A restart is required to complete installation.
- Post-install build number: 17763.8511
- Released March 10, 2026
Vulnerabilities addressed
According to the update documentation, the fixes span several Windows components:
- Windows Kernel: privilege-escalation flaws that could let a local attacker reach SYSTEM level.
- Remote Desktop Services: remote code execution issues that could allow code execution on target systems in certain configurations.
- Windows Graphics components (including DirectWrite and font rendering): flaws exploitable through crafted fonts or graphics content.
- Common Log File System (CLFS): local privilege-escalation vulnerabilities involving log file manipulation.
- Print Spooler service: local privilege-escalation issues tied to print job and driver handling.
The documentation attributes the underlying flaws to improper input validation, memory management issues and insufficient privilege checks in the base Windows 10 1809 and Server 2019 codebase.
No CVEs verified in source
The provided material describes vulnerability categories but does not list specific CVE identifiers, CVSS scores or exploitation status. Consult the Microsoft Security Update Guide for per-CVE detail.
Affected systems
- Windows 10 Version 1809 (32-bit / x86) — build 17763.8511
- Windows 10 Version 1809 (64-bit / x64) — build 17763.8511
- Windows Server 2019 (x64) — build 17763.8511
- Windows Server 2019 Server Core (x64) — build 17763.8511
Deployment and verification
Most systems configured for automatic updates will receive KB5078752 during the next update cycle. Admins can also deploy it manually from the Microsoft Update Catalog or through WSUS, SCCM and Intune. The standalone package is roughly 1.2 GB for x64 and 890 MB for 32-bit systems, and at least 2 GB of free disk space is recommended.
Verify installation
Get-HotFix -Id KB5078752
Get-ComputerInfo | Select-Object WindowsVersion, WindowsBuildLabExA successful installation reports build 17763.8511. A system restart is required to complete the update.
Known issues
- Installation may fail on systems with less than 2 GB free disk space, reporting error 0x80070070.
- Temporary system slowdown can occur during installation, particularly on machines with traditional hard drives.
- Legacy applications relying on deprecated Windows APIs may experience compatibility issues.
Microsoft advises testing the update in a non-production environment before broad deployment, especially for systems running critical applications. The update can be uninstalled via Settings > Update & Security > Windows Update > View update history > Uninstall updates.
Timeline
KB5078752 released
Microsoft releases the cumulative security update for Windows 10 1809 and Windows Server 2019, updating the build to 17763.8511.
Source: Microsoft update documentation
Confidence: Medium
Impact
Unpatched Windows 10 1809 and Server 2019 systems remain exposed to privilege-escalation and remote code execution flaws that could enable full system compromise.
Business impact
Deferred patching leaves enterprise Server 2019 fleets exposed; deployment requires testing windows and restarts.
Technical impact
Update raises build to 17763.8511 and modifies Kernel, RDS, Graphics, CLFS and Print Spooler components; a restart is required.
Security impact
Addresses local privilege escalation and remote code execution vulnerabilities across multiple Windows components.
Affected audience: IT admins, MSPs, Server 2019 operators
Action required.
Technical details
- Affected versions
- Windows 10 Version 1809 (17763.x), Windows Server 2019 (17763.x)
- Patched versions
- 17763.8511
Detection methods
- Get-HotFix -Id KB5078752 to confirm the update is installed
Mitigations
- Install KB5078752 to reach build 17763.8511
Response
Customer guidance
Microsoft delivers KB5078752 through Windows Update, the Microsoft Update Catalog, WSUS, SCCM and Intune, classifies it as a security update, and recommends non-production testing before wide deployment.
Response status: Patched
Patch available: Yes
Workaround available: No
FAQ
What does KB5078752 fix?
It resolves multiple security vulnerabilities in Windows 10 Version 1809 and Windows Server 2019, including Windows Kernel privilege escalation, Remote Desktop Services remote code execution, Windows Graphics component flaws, CLFS privilege escalation and Print Spooler vulnerabilities.
Which systems need KB5078752?
Windows 10 Version 1809 (32-bit and 64-bit), Windows Server 2019 and Windows Server 2019 Server Core. The update brings these to build 17763.8511.
How do I verify KB5078752 is installed?
Run 'Get-HotFix -Id KB5078752' in PowerShell, or check the build number with 'Get-ComputerInfo | Select-Object WindowsVersion, WindowsBuildLabEx'. A successful install reports build 17763.8511.
Are there known issues with KB5078752?
Yes. Installation may fail on systems with under 2 GB free disk space (error 0x80070070), there can be temporary slowdown during install, and some legacy apps using deprecated APIs may have compatibility issues.
The bottom line
KB5078752, released March 10, 2026, is a cumulative security update for Windows 10 1809 and Windows Server 2019 that raises the build to 17763.8511 and patches multiple component vulnerabilities.
Prioritize testing and deploying KB5078752 to close privilege-escalation and RCE exposure on 1809 and Server 2019 systems.
What happens next
Admins should stage and deploy the update, then confirm the new build across fleets. Watch for any post-deployment compatibility reports from legacy applications.
What to do
Test KB5078752 in a non-production environment, then roll it out and verify build 17763.8511.
Sources
Microsoft · Mar 10, 2026 · Primary source
Claims supported
- KB5078752 raises the build to 17763.8511 and patches multiple Windows components.
- Known issues include install failure on low disk space (0x80070070).