A potentially dangerous Request.Path value was detected from the client (&)

Questions
1

Hi All,

I have upgraded from 2 to 4.5.2 successfully.

But I am getting the following error when I click on PDF link in media folder, which has '&' in the name.

Server Error in '/' Application.

A potentially dangerous Request.Path value was detected from the client (&).

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: A potentially dangerous Request.Path value was detected from the client (&).

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.


Stack Trace: 

[HttpException (0x80004005): A potentially dangerous Request.Path value was detected from the client (&).]
   System.Web.HttpRequest.ValidateInputIfRequiredByConfig() +8884233
   System.Web.ValidateRequestExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +35
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1

Please help me.

Thanks in advance.

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/15854-a-potentially-dangerous-requestpath-value-was-detected-from-the-client