{"action":"Upgrade github.com/mattermost/mattermost-server to 0.0.0-20260414103857-b21ef302025e or later.","affected":[{"fixed":"0.0.0-20260414103857-b21ef302025e","introduced":"0.0.0-20250731163400-5b955468ea1e"},{"fixed":"11.5.2+incompatible","introduced":"11.5.0+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-4053"],"ecosystem":"Go","epss":0.00165,"exploited":false,"fixed_versions":["0.0.0-20260414103857-b21ef302025e","11.5.2+incompatible"],"ghsa_id":"GHSA-hw87-6jcq-9f8q","id":"tcs_01M5KGMB0SYH2RN7Q8KQKFHX1H","modified_at":"2026-06-25T23:01:13.651626403Z","published_at":"2026-06-25T22:34:31Z","references":["https://osv.dev/vulnerability/GO-2026-5442","https://github.com/advisories/GHSA-hw87-6jcq-9f8q","https://nvd.nist.gov/vuln/detail/CVE-2026-4053","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GO-2026-5442","url":"https://osv.dev/vulnerability/GO-2026-5442"},{"source":"nvd","source_id":"CVE-2026-4053","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4053"}],"summary":"Mattermost doesn't enforce the PostEditTimeLimit on non-message post fields in github.com/mattermost/mattermost-server"}