{"action":"Upgrade github.com/mattermost/mattermost-server to 4.0.5 or later.","affected":[{"fixed":"4.0.5","introduced":"0"},{"fixed":"4.1.1","introduced":"4.1.0"},{"fixed":"4.2.0","introduced":"4.2.0-rc1"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2017-18891"],"ecosystem":"Go","epss":0.00691,"exploited":false,"fixed_versions":["4.0.5","4.1.1","4.2.0"],"ghsa_id":"GHSA-vrh2-rprg-rgc6","id":"tcs_01M5KFPKTGV1HYNCGKV70CV1E4","modified_at":"2026-02-03T03:02:50.795995Z","published_at":"2022-05-24T17:21:05Z","references":["https://osv.dev/vulnerability/GHSA-vrh2-rprg-rgc6","https://nvd.nist.gov/vuln/detail/CVE-2017-18891","https://github.com/mattermost/mattermost/pull/7378","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":6.1},"sources":[{"source":"osv","source_id":"GHSA-vrh2-rprg-rgc6","url":"https://osv.dev/vulnerability/GHSA-vrh2-rprg-rgc6"}],"summary":"Mattermost Server does not safeguard against phishing via error page links"}