{"action":"Upgrade github.com/mattermost/mattermost-server to 3.9.2+incompatible or later.","affected":[{"fixed":"3.9.2+incompatible","introduced":"0"},{"fixed":"3.10.2+incompatible","introduced":"3.10.0+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2017-18903"],"ecosystem":"Go","epss":0.00428,"exploited":false,"fixed_versions":["3.9.2+incompatible","3.10.2+incompatible"],"ghsa_id":"GHSA-fcwg-45jh-5qhf","id":"tcs_01M5KGCZN7TABS71TG5WRZMJ96","modified_at":"2026-02-26T18:56:14.893765Z","published_at":"2026-02-26T16:27:46Z","references":["https://osv.dev/vulnerability/GO-2026-4305","https://github.com/advisories/GHSA-fcwg-45jh-5qhf","https://nvd.nist.gov/vuln/detail/CVE-2017-18903","https://github.com/mattermost/mattermost/commit/312269ad0bd166174f07f9df7391fce714601600","https://github.com/mattermost/mattermost/commit/4519b03d95e8bfe1b2f74094673ae1a2f39f6b47","https://github.com/mattermost/mattermost/commit/a18479df0940be8503c9b88993490741793eba9e","https://mattermost.com/security-updates"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"GO-2026-4305","url":"https://osv.dev/vulnerability/GO-2026-4305"}],"summary":"Mattermost Server vulnerable to CSRF if CORS is enabled in github.com/mattermost/mattermost-server"}