There are CDN links in Pages\Shared > _ValidationScriptsPartial.cshtml. Browse jquery-validate CDN library listings. Select 1.19.0/jquery.validate.min.js > Copy Link Tag with SRI.
_ValidationScriptsPartial.cshtml > jquery-validate link with new attributes:
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.19.0/jquery.validate.min.js" asp-fallback-src="~/lib/jquery-validation/dist/jquery.validate.min.js" asp-fallback-test="window.jQuery && window.jQuery.validator" integrity="sha256-bu/BP02YMudBc96kI7yklc639Mu4iKGUNNcam8D2nLc=" crossorigin="anonymous"> </script>
If you are using Individual User Accounts, you need to scaffolded the Identity UI. There are CDN links in Identity\Pages > _ValidationScriptsPartial.cshtml. The jquery.validation.unobtrusive version is 3.2.9 but we have the updated links from Pages\Shared > _ValidationScriptsPartial.cshtml. Copy and paste both updated links to Identity.