{"action":"Upgrade github.com/mattermost/mattermost-server to 3.10.2+incompatible or later.","affected":[{"fixed":"3.10.2+incompatible","introduced":"3.10.0+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2017-18906"],"ecosystem":"Go","epss":0.00789,"exploited":false,"fixed_versions":["3.10.2+incompatible"],"ghsa_id":"GHSA-fpcr-4rr5-hpcp","id":"tcs_01M5KGDYYCNMWV5V7CWVMS486F","modified_at":"2026-02-19T20:41:01.127939Z","published_at":"2026-02-17T18:09:06Z","references":["https://osv.dev/vulnerability/GO-2026-4477","https://github.com/advisories/GHSA-fpcr-4rr5-hpcp","https://nvd.nist.gov/vuln/detail/CVE-2017-18906","https://github.com/mattermost/mattermost/commit/259ad46f30d0fac2f7c5c14f3b76b2170f7e90c7","https://github.com/mattermost/mattermost/commit/b17fca0d5ee7557e3df1cf1d1da8bd749859e35f","https://github.com/mattermost/mattermost/commit/fbc170733e86f09b46ba754dd03304733d2f482f","https://mattermost.com/security-updates"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"GO-2026-4477","url":"https://osv.dev/vulnerability/GO-2026-4477"}],"summary":"Mattermost Server vulnerable to user account takeover when Single Sign-On OAuth2 is used in github.com/mattermost/mattermost-server"}