How to Fix Fix Error 0x8007048A — Security Policy Validation Failure on Windows
Getting error 0x8007048A in Windows? Security policy validation failed? Service or application blocked by security policy? Group Policy enforcement error? System integrity check returning this code? Fix this security policy validation error.
Symptoms
You might be experiencing this problem if you notice:
- •Windows service fails with security policy error 0x8007048A
- •Application launch blocked by policy validation
- •Group Policy update fails with this error code
- •Security-sensitive operations return this error
- •Event Viewer shows policy validation failures
- •User profile operations fail with security check error
Common Causes
- ⚠Local security policy database corrupted
- ⚠Group Policy objects conflicting with local policy
- ⚠Security descriptor on system objects invalid
- ⚠Credential Guard or Device Guard policy conflict
- ⚠Domain policy and local policy version mismatch
- ⚠Windows Defender Application Control blocking operations
Solutions
Solution 1: Reset Local Security Policy
- 1Reset local security policy to defaults:
- 2CMD as Admin:
- 3secedit /configure /cfg %windir%\inf\defltbase.inf /db defltbase.sdb /verbose
- 4This resets local security policy to Windows defaults
- 5Warning: custom security settings will be lost
- 6For domain-joined PCs — also refresh Group Policy:
- 7gpupdate /force /target:computer
- 8gpupdate /force /target:user
- 9Restart PC to apply all policy changes
- 10Verify in Event Viewer → Security log
- 11Look for policy application success events
- 12If domain policies are the issue: contact domain admin
Solution 2: Fix Security Descriptors
- 1Invalid security descriptors can cause this error:
- 2CMD as Admin:
- 3sfc /scannow
- 4This repairs protected system files and their security descriptors
- 5DISM /Online /Cleanup-Image /RestoreHealth
- 6For specific service security issues:
- 7sc sdshow <servicename> (view current security descriptor)
- 8If it shows an error: the descriptor is corrupted
- 9Reset service security:
- 10sc sdset <servicename> "D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWLOCRRC;;;IU)"
- 11This sets standard security allowing System, Admins, and Interactive Users
- 12Restart the service after fixing
Solution 3: Fix Advanced Security Features
- 1If Credential Guard or WDAC is involved:
- 2Check Credential Guard status:
- 3msinfo32 → System Summary → look for "Credential Guard"
- 4If enabled and causing issues:
- 5gpedit.msc → Computer Configuration → Admin Templates
- 6→ System → Device Guard → Turn On Virtualization Based Security
- 7Set to Disabled (or adjust sub-settings)
- 8For WDAC (Windows Defender Application Control):
- 9Check: C:\Windows\System32\CodeIntegrity\SIPolicy.p7b
- 10If present: this is your active WDAC policy
- 11Review with: Get-CIPolicy -FilePath (path)
- 12Contact IT admin if domain-managed
- 13For standalone PCs: rename SIPolicy.p7b → SIPolicy.p7b.bak
- 14Restart PC — this disables the WDAC policy
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