{"action":"Upgrade github.com/mattermost/mattermost-server to 5.3.2-0.20260127165411-fe3052073dc6 or later.","affected":[{"fixed":"5.3.2-0.20260127165411-fe3052073dc6","introduced":"0"},{"fixed":"10.11.11","introduced":"10.11.0-rc1"},{"fixed":"11.2.3","introduced":"11.2.0-rc1"},{"fixed":"11.3.1","introduced":"11.3.0-rc1"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-2456"],"ecosystem":"Go","epss":0.00172,"exploited":false,"fixed_versions":["5.3.2-0.20260127165411-fe3052073dc6","10.11.11","11.2.3","11.3.1"],"ghsa_id":"GHSA-34g8-9fpp-46ch","id":"tcs_01M5KET65KV4EH0XTN14HAC28G","modified_at":"2026-03-26T21:11:03.241919Z","published_at":"2026-03-16T15:30:43Z","references":["https://osv.dev/vulnerability/GHSA-34g8-9fpp-46ch","https://nvd.nist.gov/vuln/detail/CVE-2026-2456","https://github.com/mattermost/mattermost/commit/fe3052073dc67e3c920baf9fe7efd44ac1d8124c","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-34g8-9fpp-46ch#Go/github.com/mattermost/mattermost-server","url":"https://osv.dev/vulnerability/GHSA-34g8-9fpp-46ch"}],"summary":"Mattermost fails to limit the size of responses from integration action endpoints"}