{"id":"CVE-2017-18899","details":"An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. It mishandles IP-based rate limiting.","modified":"2026-10-24T10:30:34.529613370Z","published":"2020-06-19T19:15:11.437Z","database_specific":{},"references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/mattermost","events":[{"introduced":"0"},{"fixed":"ff513427371cd84e07b19c0586d419dbed976b31"},{"introduced":"0033e3e37b12cb5d951d21492500d66a6abc472b"},{"fixed":"5549c9149e80537d0f431b6b3ebf638c35568c4f"},{"introduced":"f968c56890bd84295672ee0d46cc846cac2dbd47"},{"last_affected":"a5ce36d0882ae1b4b409a7b68233bf89591a5f95"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"0"},{"fixed":"4.0.5"}],"source":"CPE_RANGE","cpe":"cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*"},{"cpe":"cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*","range":[{"introduced":"4.1.0"},{"fixed":"4.1.1"}],"source":"CPE_RANGE"},{"source":"CPE_STRING","cpe":"cpe:2.3:a:mattermost:mattermost_server:4.2.0:rc1:*:*:*:*:*:*","range":[{"introduced":"4.2.0-rc1"},{"last_affected":"4.2.0-rc1"}]},{"cpe":"cpe:2.3:a:mattermost:mattermost_server:4.2.0:rc2:*:*:*:*:*:*","range":[{"introduced":"4.2.0-rc2"},{"last_affected":"4.2.0-rc2"}],"source":"CPE_STRING"},{"source":"CPE_STRING","cpe":"cpe:2.3:a:mattermost:mattermost_server:4.2.0:rc3:*:*:*:*:*:*","range":[{"introduced":"4.2.0-rc3"},{"last_affected":"4.2.0-rc3"}]},{"source":"CPE_STRING","cpe":"cpe:2.3:a:mattermost:mattermost_server:4.2.0:rc4:*:*:*:*:*:*","range":[{"introduced":"4.2.0-rc4"},{"last_affected":"4.2.0-rc4"}]}]}}],"versions":["4.2.0-rc1","4.2.0-rc2","4.2.0-rc3","4.2.0-rc4","v4.2.0-rc4","v4.2.0","v4.2.0-rc3","v4.2.0-rc2","v4.2.0-rc1","v4.0.4-rc1","v4.0.4","v4.1.0","v4.0.3","v4.0.2","v4.0.1","v4.0.0","v0.5.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-18899.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}