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Unknown error (security validation) when modifying user permission on a master page?

Posted on 2011-02-13
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Last Modified: 2012-05-11
We have a inner master page wth custom css that our departments are "supposed" to be able to edit however it is not working that way.
I am the farm administrator and site collection admin.  I went to remove a user from the master page and received an error.  Can you tell me what might be causing this and how I can fix this...
The only workaround I have right now is to turn off security validation in Central Admin but I can't do this each time a user needs to add a user or add an object to a library...

System.Runtime.InteropServices.COMException: The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again.  
 at Microsoft.SharePoint.Library.SPRequestInternalClass.UpdateMembers(String bstrUrl, UInt32 dwObjectType, String bstrObjId, Guid& pguidScopeId, Int32 lGroupID, Int32 lGroupOwnerId, Object& pvarArrayAdd, Object& pvarArrayAddIds, Object& pvarArrayLoginsRemove, Object& pvarArrayIdsRemove, Boolean bRemoveFromCurrentScopeOnly, Boolean bSendEmail)    
 at Microsoft.SharePoint.Library.SPRequest.UpdateMembers(String bstrUrl, UInt32 dwObjectType, String bstrObjId, Guid& pguidScopeId, Int32 lGroupID, Int32 lGroupOwnerId, Object& pvarArrayAdd, Object& pvarArrayAddIds, Object& pvarArrayLoginsRemove, Object& pvarArrayIdsRemove, Boolean bRemoveFromCurrentScopeOnly, Boolean bSendEmail)
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Question by:swtjen1
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LVL 14

Expert Comment

by:KoenVosters
ID: 34889612
They are probably using custom code, and in that custom code the yare not using AllowUnsafeUpdates correctly.

http://www.sharepoint-tips.com/2007/09/security-validation-for-this-page-is.html
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Author Comment

by:swtjen1
ID: 34920644
Well I'm so glad the consultants used custom code so that they could leave me with it.

How do I fix this where it can allow safe updates???
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Accepted Solution

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KoenVosters earned 2000 total points
ID: 34923977
You will have to implement the solution in the code, recompile, test and redeploy.
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LVL 14

Expert Comment

by:KoenVosters
ID: 34923978
You will have to implement the solution in the code, recompile, test and redeploy.
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