When using the SimpleLDAP authentication in conjunction with Microsoft’s Active Directory, Percona has discovered a flaw that would allow authentication to complete when passing a blank value for the account password, leading to access against the service integrated with which Active Directory is deployed at the level granted to the authenticating account.
Percona Server for Mysql 8.x. < 8.0.21
Percona XtraDB Cluster 8.x. < 18.104.22.168-3
Only the exact minor versions listed here are affected: 3.6.19-7.0, 4.0.18-11, 4.0.19-12, 4.0.20-13, 4.2.5-5, 4.2.6-6, 4.2.7-7, 4.2.8-8, 4.2.9-9, 4.4.0-1, 4.4.1-2