{"action":"Upgrade github.com/mattermost/mattermost-server to 4.0.5+incompatible or later.","affected":[{"fixed":"4.0.5+incompatible","introduced":"0"},{"fixed":"4.1.1+incompatible","introduced":"4.1.0+incompatible"},{"fixed":"4.2.0+incompatible","introduced":"4.2.0-rc1+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2017-18897"],"ecosystem":"Go","epss":0.00691,"exploited":false,"fixed_versions":["4.0.5+incompatible","4.1.1+incompatible","4.2.0+incompatible"],"ghsa_id":"GHSA-f7c3-7vp3-44p6","id":"tcs_01M5KGCZ2H1FXAF30C3TDT39Z3","modified_at":"2026-03-03T04:57:53.210203Z","published_at":"2026-01-13T16:42:40Z","references":["https://osv.dev/vulnerability/GO-2026-4301","https://github.com/advisories/GHSA-f7c3-7vp3-44p6","https://nvd.nist.gov/vuln/detail/CVE-2017-18897","https://github.com/mattermost/mattermost/commit/3c34e2b2dcb0fde96a10e68d877aa7d0ab511669","https://github.com/mattermost/mattermost/commit/722fb1947a2e7395ccf16adce9206736d803a9f3","https://github.com/mattermost/mattermost/commit/d38328976e2c8bb0fab91e656042a0d8ac37bc76","https://mattermost.com/security-updates"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"GO-2026-4301","url":"https://osv.dev/vulnerability/GO-2026-4301"}],"summary":"Mattermost Server mishandles redirect denial action in github.com/mattermost/mattermost-server"}