{"id":"CVE-2019-20890","url":"https://www.cyber-defence.io/tools/cve/CVE-2019-20890","generatedAt":"2026-10-27T22:25:15.167Z","title":"It allows a bypass of e-mail address discovery restrictions.","description":"An issue was discovered in Mattermost Server before 5.7. It allows a bypass of e-mail address discovery restrictions.","published":"2020-06-19T17:15:14.000Z","lastModified":"2026-06-17T02:31:23.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"},"cwe":[],"affected":["mattermost/mattermost server"],"epss":{"score":0.00775,"percentile":0.55498,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.78%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://mattermost.com/security-updates/","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://mattermost.com/security-updates/","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-20890","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}