{"action":"Upgrade github.com/mattermost/mattermost-server to 4.1.2+incompatible or later.","affected":[{"fixed":"4.1.2+incompatible","introduced":"0"},{"fixed":"4.2.1+incompatible","introduced":"4.2.0-rc1+incompatible"},{"fixed":"4.3.0+incompatible","introduced":"4.3.0-rc1+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2017-18889"],"ecosystem":"Go","epss":0.00669,"exploited":false,"fixed_versions":["4.1.2+incompatible","4.2.1+incompatible","4.3.0+incompatible"],"ghsa_id":"GHSA-jp57-4x34-5v94","id":"tcs_01M5KGC7Q8ABNSNZ8FP7EJYCZ7","modified_at":"2026-03-03T04:57:45.172185Z","published_at":"2025-12-15T19:37:35Z","references":["https://osv.dev/vulnerability/GO-2025-4201","https://github.com/advisories/GHSA-jp57-4x34-5v94","https://nvd.nist.gov/vuln/detail/CVE-2017-18889","https://mattermost.com/security-updates"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"GO-2025-4201","url":"https://osv.dev/vulnerability/GO-2025-4201"}],"summary":"Mattermost Server is vulnerable to webhook and slash command manipulation in github.com/mattermost/mattermost-server"}