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SS-2018-010: Member disclosure in login form

Severity:
Low (?)
Identifier:
SS-2018-010
Versions Affected:
>=4.0.0
Versions Fixed:
4.0.4, 4.1.1
Release Date:
2018-05-28

There is a user ID enumeration vulnerability in our brute force error messages.

This means an attacker can infer or confirm user details that exist in the member table.

This issue has been resolved by ensuring that login attempt logging and lockout process works equivalently for non-existent users as it does for existant users.

This is a regression of SS-2017-002.

Reported by Dan Hensby of SilverStripe.