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

PKSA-9qm5-hby2-7bvn CVE-2021-21424 GHSA-5pv8-ppvj-4h68

Affected package: symfony/security-http

Affected version: >=5.1.0,<5.2.0|>=5.2.0,<5.2.8

Reported by:
GitHub, FriendsOfPHP/security-advisories