{"action":"Upgrade github.com/mattermost/mattermost-server to 4.2.2+incompatible or later.","affected":[{"fixed":"4.2.2+incompatible","introduced":"0"},{"fixed":"4.3.4+incompatible","introduced":"4.3.0-rc1+incompatible"},{"fixed":"4.4.5+incompatible","introduced":"4.4.0-rc1+incompatible"},{"fixed":"4.5.0+incompatible","introduced":"4.5.0-rc1+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2017-18871"],"ecosystem":"Go","epss":0.01124,"exploited":false,"fixed_versions":["4.2.2+incompatible","4.3.4+incompatible","4.4.5+incompatible","4.5.0+incompatible"],"ghsa_id":"GHSA-jc6w-8r7f-vmp5","id":"tcs_01M5KGC4XHGEEEZBR9WSYGFAJ1","modified_at":"2026-03-03T04:57:47.614932Z","published_at":"2025-12-08T21:31:36Z","references":["https://osv.dev/vulnerability/GO-2025-4184","https://github.com/advisories/GHSA-jc6w-8r7f-vmp5","https://nvd.nist.gov/vuln/detail/CVE-2017-18871","https://mattermost.com/security-updates"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"GO-2025-4184","url":"https://osv.dev/vulnerability/GO-2025-4184"}],"summary":"Mattermost Server vulnerable to Denial of Service through `@` character prefix inserted into JavaScript field names in github.com/mattermost/mattermost-server"}