{"id":"CVE-2018-21253","details":"An issue was discovered in Mattermost Server before 5.1, 5.0.2, and 4.10.2. An attacker could use the invite_people slash command to invite a non-permitted user.","modified":"2026-08-27T08:14:47.090487Z","published":"2020-06-19T17:15:12.537Z","references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/mattermost","events":[{"introduced":"0"},{"fixed":"f866d5c859412c7dedce100774bfc1c0c2077b49"},{"introduced":"85a75526c7c03fca1d14a39cfb3f2638d98d3fe1"},{"fixed":"6b04b984f74a0526030e71b64e961003d75bd421"},{"introduced":"7c855c30dbb0326901a9c087bedd7286dafac47f"},{"last_affected":"54994502241bf40bebd9a9d7719c58f708aef5b1"}],"database_specific":{"cpe":["cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:5.1.0:rc1:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:5.1.0:rc2:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:5.1.0:rc3:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:5.1.0:rc4:*:*:*:*:*:*"],"extracted_events":[{"introduced":"0"},{"fixed":"4.10.2"},{"introduced":"5.0.0"},{"fixed":"5.0.2"},{"introduced":"5.1.0-rc1"},{"last_affected":"5.1.0-rc1"},{"introduced":"5.1.0-rc2"},{"last_affected":"5.1.0-rc2"},{"introduced":"5.1.0-rc3"},{"last_affected":"5.1.0-rc3"},{"introduced":"5.1.0-rc4"},{"last_affected":"5.1.0-rc4"}],"source":["CPE_RANGE","CPE_STRING"]}}],"versions":["5.1.0-rc1","5.1.0-rc2","5.1.0-rc3","5.1.0-rc4","v5.1.0-rc4","v5.1.0","v5.1.0-rc3","v5.0.1-rc1","v5.0.1","v5.0.0-rc7","v5.0.0-rc6","v5.0.0","v4.10.1-rc1","v4.10.1","v5.1.0-rc2","v5.1.0-rc1","v4.10.0-rc5","v4.10.0-rc4","v4.10.0","v4.10.0-rc3","v4.10.0-rc2","v4.10.0-rc1","v4.9.0-rc1","v4.8.0-rc1","v4.7.0-rc1","v4.6.0-rc2","v4.6.0-rc1","v4.5.0-rc1","v4.4.0-rc1","v4.3.0-rc1","v4.2.0-rc1","v0.5.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-21253.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"}]}