GHSA-64CV-VXPR-J6VC edx-enterprise has SSRF via SAML metadata URL in sync_provider_data endpoint

Summary The syncproviderdata endpoint in SAMLProviderDataViewSet fetches SAML metadata from a URL stored in SAMLProviderConfig.metadatasource. An authenticated user with the Enterprise Admin role can set this field to an arbitrary URL via the SAMLProviderConfigViewSet PATCH endpoint, then trigger...