[Microsoft.AspNetCore.SpaServices] Elevation of privilege in ASP.NET Core

An elevation of privilege vulnerability exists when a ASP.NET Core web application, created using vulnerable project templates, fails to properly sanitize web requests, aka ‘ASP.NET Core Elevation Of Privilege Vulnerability’.

References

• https://nvd.nist.gov/vuln/detail/CVE-2019-1302
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1302
• https://github.com/aspnet/Announcements/issues/384
• https://github.com/github/advisory-database/issues/302
• https://github.com/advisories/GHSA-xr8f-59pp-rxxh