{"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-2017-18891"],"ecosystem":"Go","epss":0.00691,"exploited":false,"fixed_versions":["4.0.5+incompatible","4.1.1+incompatible","4.2.0+incompatible"],"ghsa_id":"GHSA-vrh2-rprg-rgc6","id":"tcs_01M5KGCYKMF9AXV6CKZ3TCDVZJ","modified_at":"2026-03-03T04:57:51.410476Z","published_at":"2026-01-13T16:42:40Z","references":["https://osv.dev/vulnerability/GO-2026-4298","https://github.com/advisories/GHSA-vrh2-rprg-rgc6","https://nvd.nist.gov/vuln/detail/CVE-2017-18891","https://github.com/mattermost/mattermost/pull/7378","https://mattermost.com/security-updates"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"GO-2026-4298","url":"https://osv.dev/vulnerability/GO-2026-4298"}],"summary":"Mattermost Server does not safeguard against phishing via error page links in github.com/mattermost/mattermost-server"}