{"id":"CVE-2018-6521","aliases":["DEBIAN-CVE-2018-6521","DLA-1273-1","DSA-4127-1","EUVD-2022-5030","GHSA-qv5p-6wrc-79wg","UBUNTU-CVE-2018-6521"],"status":"published","title":"SimpleSAMLphp Use of insecure connection charset (sqlauth module)","description":"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.","severity":{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.03053,"percentile":0.8767,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2018-02-02T01:00:00Z","modified":"2026-10-24T10:31:06Z","fixes":[{"ecosystem":"Packagist","package":"simplesamlphp/simplesamlphp","fixed_in":["1.15.2"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:12","package":"simplesamlphp","fixed_in":["1.15.2-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"simplesamlphp","fixed_in":["1.15.2-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"simplesamlphp/simplesamlphp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15.2"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"simplesamlphp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15.2-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"simplesamlphp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15.2-1"}]}],"versions":["1.10.0-1","1.11.0-1","1.12.0-1","1.12.0~rc1-1","1.12.0~rc2-1","1.13.0-1","1.13.1-1","1.13.1-2","1.13.2-1","1.14.0-1","1.14.1-1","1.14.10-1","1.14.11-1","1.14.15-1","1.14.2-1","1.14.2-2","1.14.3-1","1.14.4-1","1.14.5-1","1.14.6-1","1.14.7-1","1.14.8-1","1.14.9-1","1.15.0-1","1.15.1-1","1.6.0-1","1.6.1-1","1.6.2-1","1.6.3-1","1.6.3-2","1.6.3-3","1.7.0-1","1.7.0-2","1.8.0-1","1.8.1-1","1.8.2-1","1.9.0-1","1.9.0~rc1-1","1.9.0~rc2-1","1.9.1-1","1.9.2-1"]},{"source":"osv","ecosystem":"Debian:7","package":"simplesamlphp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.2-1+deb7u2"}]}],"versions":["1.9.2-1","1.9.2-1+deb7u1"],"bundled":3},{"source":"osv","ecosystem":"Debian:8","package":"simplesamlphp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.13.1-2+deb8u1"}]}],"versions":["1.13.1-2"],"bundled":9},{"source":"osv","ecosystem":"Debian:9","package":"simplesamlphp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.14.11-1+deb9u1"}]}],"versions":["1.14.11-1"],"bundled":9},{"source":"osv","ecosystem":"Packagist","package":"simplesamlphp/simplesamlphp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15.2"}]}],"versions":["v1.12.0","v1.13.0","v1.13.0-rc1","v1.13.0-rc2","v1.13.1","v1.13.2","v1.14.0","v1.14.0-rc1","v1.14.1","v1.14.10","v1.14.11","v1.14.12","v1.14.13","v1.14.14","v1.14.15","v1.14.16","v1.14.17","v1.14.2","v1.14.3","v1.14.4","v1.14.5","v1.14.6","v1.14.7","v1.14.8","v1.14.9","v1.15.0","v1.15.0-rc1","v1.15.0-rc2","v1.15.0-rc3","v1.15.1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"simplesamlphp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.2-1","1.14.0-1","1.14.0-1ubuntu2","1.14.0-1ubuntu2+esm1"]}],"products":[{"vendor":"debian","product":"debian_linux"},{"vendor":"simplesamlphp","product":"simplesamlphp"}],"references":[{"url":"https://simplesamlphp.org/security/201801-03","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory","web","report"]},{"url":"https://lists.debian.org/debian-lts-announce/2018/02/msg00008.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Exploit","Mailing List","Third Party Advisory","evidence","web"]},{"url":"https://www.debian.org/security/2018/dsa-4127","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-6521","tags":["advisory"]},{"url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/simplesamlphp/simplesamlphp/CVE-2018-6521.yaml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-qv5p-6wrc-79wg"},{"url":"https://security-tracker.debian.org/tracker/CVE-2018-6521","tags":["advisory"]},{"url":"https://github.com/simplesamlphp/simplesamlphp","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2018-6521","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-6521","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2018-6521","description":"The sqlauth module in SimpleSAMLphp before 1.15.2 relies on the MySQL utf8 charset, which truncates queries upon encountering four-byte characters. 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