{"action":"No fix published. Pin and monitor.","affected":[{"introduced":"0"}],"component":"github.com/mattermost/mattermost-server/v6","cve_ids":["CVE-2026-4265"],"ecosystem":"Go","epss":0.00379,"exploited":false,"fixed_versions":[],"ghsa_id":"GHSA-xpvf-6qcc-9jqc","id":"tcs_01M5KGFVT0CHE6PHBDYX6MSC2N","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#Go/github.com/mattermost/mattermost-server/v6","url":"https://osv.dev/vulnerability/GO-2026-4749"}],"summary":"Mattermost fails to validate team-specific upload_file permissions in github.com/mattermost/mattermost-server"}