{"id":"CVE-2018-21260","details":"An issue was discovered in Mattermost Server before 4.8.1, 4.7.4, and 4.6.3. WebSocket events were accidentally sent during certain user-management operations, violating user privacy.","modified":"2026-07-08T19:45:34.671374Z","published":"2020-06-19T17:15:12.897Z","references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/mattermost","events":[{"introduced":"58defb7424773c75718f0173f4ace702cffa4f0e"},{"fixed":"af9e5773f1b33576d59a62c5a769e0aa72e232dd"},{"introduced":"9360131992064203f9ee46fa0504d20276c97339"},{"fixed":"2b06c0db46104a72dcbb8f47b3d501b9abb29228"},{"introduced":"d1ed79a66c7930020b7fda046a11050f5890c84e"},{"fixed":"6dc9fa885dfd5448fb6910bfb0cb4f1179139ff8"}],"database_specific":{"cpe":"cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"4.6.0"},{"fixed":"4.6.3"},{"introduced":"4.7.0"},{"fixed":"4.7.4"},{"introduced":"4.8.0"},{"fixed":"4.8.1"}],"source":"CPE_RANGE"}}],"versions":["v4.6.2-rc1","v4.6.2","v4.6.1-rc1","v4.6.1","v4.8.0-rc6","v4.8.0-rc5","v4.8.0","v4.7.3-rc1","v4.7.3","v4.7.2-rc3","v4.7.2-rc2","v4.7.2-rc1","v4.7.2","v4.7.1-rc1","v4.7.1","v4.7.0-rc4","v4.7.0","v4.6.0-rc6","v4.6.0-rc5","v4.6.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-21260.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N"}]}