Update MSRC Reporting Process (#121303)

MSRC no longer directly accepts e-mail submissions via
[email protected]. Submissions must be reported via the MSRC portal
or a one-time token for e-mail submission obtained from the MSRC portal.

This proposal updates the README.md and SECURITY.md to reflect these
changes.

Author: sirredbeard

README.md

@@ -37,7 +37,7 @@ We welcome contributions! Many people all over the world have helped make this p
 
 ## Reporting security issues and security bugs
 
-Security issues and bugs should be reported privately, via email, to the Microsoft Security Response Center (MSRC) <secure@microsoft.com>. You should receive a response within 24 hours. If for some reason you do not, please follow up via email to ensure we received your original message. Further information, including the MSRC PGP key, can be found in the [Security TechCenter](https://www.microsoft.com/msrc/faqs-report-an-issue). You can also find these instructions in this repo's [Security doc](SECURITY.md).
+Security issues and bugs should be reported privately to the Microsoft Security Response Center (MSRC) via the [MSRC Researcher Portal](https://msrc.microsoft.com/report/vulnerability/new). You should receive a response within 24 hours. Further information can be found in the [Security TechCenter](https://www.microsoft.com/msrc/faqs-report-an-issue). You can also find these instructions in this repo's [Security doc](SECURITY.md).
 
 Also see info about related [Microsoft .NET Bounty Program](https://www.microsoft.com/msrc/bounty-dot-net-core).
 

SECURITY.md

@@ -6,9 +6,9 @@ The .NET Core and ASP.NET Core support policy, including supported versions can
 
 ## Reporting a Vulnerability
 
-Security issues and bugs should be reported privately to the Microsoft Security Response Center (MSRC), either by emailing [email protected] or via the portal at https://msrc.microsoft.com.
+Security issues and bugs should be reported privately to the Microsoft Security Response Center (MSRC), via the [MSRC Researcher Portal](https://msrc.microsoft.com/report/vulnerability/new).
 You should receive a response within 24 hours. If for some reason you do not, please follow up via email to ensure we received your
-original message. Further information, including the MSRC PGP key, can be found in the [MSRC Report an Issue FAQ](https://www.microsoft.com/en-us/msrc/faqs-report-an-issue).
+original message. Further information can be found in the [MSRC Report an Issue FAQ](https://www.microsoft.com/en-us/msrc/faqs-report-an-issue).
 
 Reports via MSRC may qualify for the .NET Core Bug Bounty. Details of the .NET Core Bug Bounty including terms and conditions are at [https://aka.ms/corebounty](https://aka.ms/corebounty).