** UNSUPPORTED WHEN ASSIGNED ** Citrix XenApp 6.5, when 2FA is enabled, allows a remote unauthenticated attacker to ascertain whether a user exists on the server, because the 2FA error page only occurs after a valid username is entered. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13998
Reference (s):
- https://gist.github.com/kampji/11e259d68ad98a6f0f898132f1961a96