The sqlauth module in SimpleSAMLphp before 1.15.2 relies on the MySQL utf8 charset, which truncates queries upon encountering four-byte characters. There might be a scenario in which this allows remote attackers to bypass intended access restrictions.
github.com/FriendsOfPHP/security-advisories/blob/master/simplesamlphp/simplesamlphp/CVE-2018-6521.yaml
github.com/simplesamlphp/simplesamlphp
lists.debian.org/debian-lts-announce/2018/02/msg00008.html
nvd.nist.gov/vuln/detail/CVE-2018-6521
simplesamlphp.org/security/201801-03
www.debian.org/security/2018/dsa-4127