{"cve":"CVE-2017-18911","nvd":{"published":"2020-06-19T19:15:11.937","modified":"2026-06-17T01:13:48.973","status":"Modified","description":"An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. The X.509 certificate validation can be skipped for a TLS-based e-mail server.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-295"],"references":["https://mattermost.com/security-updates/","https://mattermost.com/security-updates/"],"products":["mattermost:mattermost_server"],"source":"nvd","synced_at":"2026-10-19T21:05:42.039641217+00:00"},"epss":{"cve":"CVE-2017-18911","score":0.00669,"percentile":0.51981,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-m462-mqw4-2c8m","url":"https://osv.dev/vulnerability/GHSA-m462-mqw4-2c8m","summary":"Mattermost Server has X.509 Improper Certificate Validation","modified":"2026-02-22T23:03:29.930080Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":["<3.6.7-rc1"],"fixed":["3.6.7-rc1"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=3.7.0 <3.7.5"],"fixed":["3.7.5"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=3.8.0 <3.8.2"],"fixed":["3.8.2"]}]},{"id":"GO-2026-4464","url":"https://osv.dev/vulnerability/GO-2026-4464","summary":"Mattermost Server has X.509 Improper Certificate Validation in github.com/mattermost/mattermost-server","modified":"2026-02-19T20:41:26.362107Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":["<3.6.7-rc1+incompatible",">=3.7.0+incompatible <3.7.5+incompatible",">=3.8.0+incompatible <3.8.2+incompatible"],"fixed":["3.6.7-rc1+incompatible","3.7.5+incompatible","3.8.2+incompatible"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}