{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.12+incompatible or later.","affected":[{"fixed":"10.11.12+incompatible","introduced":"10.11.0-rc1+incompatible"},{"fixed":"11.2.4+incompatible","introduced":"11.2.0-rc1+incompatible"},{"fixed":"11.3.2+incompatible","introduced":"11.3.0-rc1+incompatible"},{"fixed":"11.4.1+incompatible","introduced":"11.4.0-rc1+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-26233"],"ecosystem":"Go","epss":0.00311,"exploited":false,"fixed_versions":["10.11.12+incompatible","11.2.4+incompatible","11.3.2+incompatible","11.4.1+incompatible"],"ghsa_id":"GHSA-247x-7qw8-fp98","id":"tcs_01M5KGGZAB9GYJWVTCBM3GP7CY","modified_at":"2026-04-02T21:20:02.374344Z","published_at":"2026-04-02T18:42:30Z","references":["https://osv.dev/vulnerability/GO-2026-4916","https://github.com/advisories/GHSA-247x-7qw8-fp98","https://nvd.nist.gov/vuln/detail/CVE-2026-26233","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"GO-2026-4916","url":"https://osv.dev/vulnerability/GO-2026-4916"},{"source":"nvd","source_id":"CVE-2026-26233","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26233"}],"summary":"Mattermost doesn't rate limit login requests, allowing DoS in github.com/mattermost/mattermost-server"}