Hi Abahrami,
Thank you for your interest in Syncfusion products.
I am afraid that I was not able to reproduce the issue "This Page has unspecified potential security flaw. Would you like to continue?" This message appears whenever show the Syncfusion diagram.
Download the sample from the below link:
http://websamples.syncfusion.com/samples/Diagram.Web/5.2.0.25/F69065/main.htmTake a look into this sample and could you please send me your sample with more details, so that we would be able to reproduce the issue and investigate further on this issue.
Please let me know if you have any other queries.
Best Regards,
Bhuvana