{"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-2026-4265"],"ecosystem":"Go","epss":0.00379,"exploited":false,"fixed_versions":["10.11.11+incompatible","11.2.3+incompatible","11.3.1+incompatible"],"ghsa_id":"GHSA-xpvf-6qcc-9jqc","id":"tcs_01M5KGFVF66CS8N3T47W62HMP1","modified_at":"2026-03-23T18:45:18.057051Z","published_at":"2026-03-23T18:14:47Z","references":["https://osv.dev/vulnerability/GO-2026-4749","https://github.com/advisories/GHSA-xpvf-6qcc-9jqc","https://nvd.nist.gov/vuln/detail/CVE-2026-4265","https://github.com/mattermost/mattermost/commit/c7f6efdfb035490f494b3177996ee5f4b278c988","https://mattermost.com/security-updates"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"GO-2026-4749","url":"https://osv.dev/vulnerability/GO-2026-4749"}],"summary":"Mattermost fails to validate team-specific upload_file permissions in github.com/mattermost/mattermost-server"}