error deleting forum thread

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Please do not report problems with a custom build or custom code in this forum. If you are producing your own build from the source code and have problems or questions, ask in the developer forum.
3/28/2020 4:42:02 PM
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error deleting forum thread

Hi, I'm on version  2.7.0.0 MSSQL

If I try to edit a forum thread I get an error "A potentially dangerous Request.Path value was detected from the client" - it's impossible to delete the thread without hacking the database.

The edit URL looks like this, so I can imagine the browser might see it as a threat - 

http://(mydomain)/Forums/Controls/%3C%25=%20$%22%7BSiteRoot%7D/Forums/EditThread.aspx?thread={DataBinder.Eval(Container.DataItem,%22ThreadID%22)}&mid={ModuleId}&pageid={PageId.ToString()}%22%20%%3E

Here's the log entry:

2020-03-28 21:16:29,717 ERROR 212.159.117.250 - (null) - (null) - mojoPortal.Web.Global - 212.159.117.250 /Forums/Controls/<%= $"{SiteRoot}/Forums/EditThread.aspx?thread={DataBinder.Eval(Container.DataItem,%22ThreadID%22)}&mid={ModuleId}&pageid={PageId.ToString()}%22%20%%3E Referrer(http://www.maswell.org.uk/Forums/ForumView.aspx?pageid=236&f=46~1) useragent Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36 
System.Web.HttpException (0x80004005): A potentially dangerous Request.Path value was detected from the client (<).
   at System.Web.HttpRequest.ValidateInputIfRequiredByConfig()
   at System.Web.HttpApplication.PipelineStepManager.ValidateHelper(HttpContext context)

 

I originally got the error with Chrome but also get it with Edge

Have you come across this - is there a workaround?

Thanks

Ian