[MEDIUM] CVE-2021-21424: Prevent user enumeration via response content in authentication mechanisms

PKSA-nvyj-nkn9-3qq7 CVE-2021-21424 GHSA-5pv8-ppvj-4h68

Affected version: >=1.27.0,<1.28.0|>=1.28.0,<1.29.0|>=1.29.0,<1.29.2|>=1.30.0,<1.31.0|>=1.31.0,<1.31.1

Reported by:
GitHub, FriendsOfPHP/security-advisories