{"id":"CVE-2019-20855","details":"An issue was discovered in Mattermost Server before 5.16.1, 5.15.2, 5.14.5, and 5.9.6. It allows attackers to obtain sensitive information (local files) during legacy attachment migration.","modified":"2026-04-10T04:17:33.705582Z","published":"2020-06-19T15:15:10.430Z","references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/mattermost-server","events":[{"introduced":"0"},{"fixed":"243500a4c032b5954fb41f2abe41cf4be34176fa"},{"introduced":"3f905844dfda14efa5f4a597b97195d411b814ef"},{"fixed":"e13dad9fd4b6b8b1893f0351f0012506461f1044"},{"introduced":"f4f7fd0829d74fcd5e290fd1ba76845af18e553e"},{"fixed":"32f365efeed3be1847de1da8e96e1c673400354e"},{"introduced":"6597fdb40134965e26f715854dc85f5e6cfaa6df"},{"fixed":"b000d2fbfb2ae8104c890c921c4a518c553b4803"}],"database_specific":{"versions":[{"introduced":"0"},{"fixed":"5.9.6"},{"introduced":"5.14.0"},{"fixed":"5.14.5"},{"introduced":"5.15.0"},{"fixed":"5.15.2"},{"introduced":"5.16.0"},{"fixed":"5.16.1"}]}}],"versions":["v0.5.0","v4.10.0-rc1","v4.2.0-rc1","v4.3.0-rc1","v4.4.0-rc1","v4.5.0-rc1","v4.6.0-rc1","v4.6.0-rc2","v4.7.0-rc1","v4.8.0-rc1","v4.9.0-rc1","v5.0.0-rc1","v5.1.0-rc1","v5.14.0","v5.14.0-rc5","v5.14.1","v5.14.1-rc1","v5.14.2","v5.14.2-rc1","v5.14.3","v5.14.3-rc1","v5.14.4","v5.14.4-rc1","v5.15.0","v5.15.0-rc4","v5.15.1","v5.15.1-rc1","v5.16.0","v5.16.0-rc3","v5.2.0-rc1","v5.2.0-rc2","v5.8.0","v5.8.0-rc1","v5.8.0-rc2","v5.8.0-rc3","v5.8.0-rc4","v5.9.0","v5.9.0-rc1","v5.9.0-rc2","v5.9.0-rc3","v5.9.0-rc4","v5.9.1","v5.9.1-rc1","v5.9.2","v5.9.2-rc1","v5.9.3","v5.9.3-rc1","v5.9.4","v5.9.4-rc1","v5.9.5","v5.9.5-rc1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-20855.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}