{"action":"No fix published. Pin and monitor.","affected":[{"introduced":"0"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2017-18909"],"ecosystem":"Go","epss":0.00656,"exploited":false,"fixed_versions":[],"ghsa_id":"GHSA-r6j5-fqx9-7qv9","id":"tcs_01M5KGDZ38BN58Z5V640TRSA0P","modified_at":"2026-02-19T20:41:06.840451Z","published_at":"2026-02-17T18:09:06Z","references":["https://osv.dev/vulnerability/GO-2026-4478","https://github.com/advisories/GHSA-r6j5-fqx9-7qv9","https://nvd.nist.gov/vuln/detail/CVE-2017-18909","https://github.com/mattermost/mattermost/commit/4f074fed0d653a28779ac586e418341232d43e95","https://mattermost.com/security-updates"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"GO-2026-4478","url":"https://osv.dev/vulnerability/GO-2026-4478"}],"summary":"Mattermost Server SAML implementation does not require encryption or signature verification as default in github.com/mattermost/mattermost-server"}