{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.11+incompatible or later.","affected":[{"fixed":"10.11.11+incompatible","introduced":"10.11.0-rc1+incompatible"},{"fixed":"11.2.3+incompatible","introduced":"11.2.0-rc1+incompatible"},{"fixed":"11.3.1+incompatible","introduced":"11.3.0-rc1+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-2456"],"ecosystem":"Go","epss":0.00168,"exploited":false,"fixed_versions":["10.11.11+incompatible","11.2.3+incompatible","11.3.1+incompatible"],"ghsa_id":"GHSA-34g8-9fpp-46ch","id":"tcs_01M5KGFHYJJ40RDFMFSKRJ0M9H","modified_at":"2026-03-26T21:03:04.057221Z","published_at":"2026-03-26T20:33:02Z","references":["https://osv.dev/vulnerability/GO-2026-4726","https://github.com/advisories/GHSA-34g8-9fpp-46ch","https://nvd.nist.gov/vuln/detail/CVE-2026-2456","https://github.com/mattermost/mattermost/commit/fe3052073dc67e3c920baf9fe7efd44ac1d8124c","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":5.7},"sources":[{"source":"osv","source_id":"GO-2026-4726","url":"https://osv.dev/vulnerability/GO-2026-4726"},{"source":"nvd","source_id":"CVE-2026-2456","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2456"}],"summary":"Mattermost fails to limit the size of responses from integration action endpoints in github.com/mattermost/mattermost-server"}