{"action":"No fix published. Pin and monitor.","affected":[{"introduced":"0"}],"component":"github.com/mattermost/mattermost-server/v5","cve_ids":["CVE-2026-27659"],"ecosystem":"Go","epss":0.00125,"exploited":false,"fixed_versions":[],"ghsa_id":"GHSA-rmhw-c3xr-m3xx","id":"tcs_01M5KGNRQAW288CEH1HQ1RTC7T","modified_at":"2026-06-25T23:01:25.123884537Z","published_at":"2026-06-25T22:34:34Z","references":["https://osv.dev/vulnerability/GO-2026-5629","https://github.com/advisories/GHSA-rmhw-c3xr-m3xx","https://nvd.nist.gov/vuln/detail/CVE-2026-27659","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.6},"sources":[{"source":"osv","source_id":"GO-2026-5629#Go/github.com/mattermost/mattermost-server/v5","url":"https://osv.dev/vulnerability/GO-2026-5629"},{"source":"nvd","source_id":"CVE-2026-27659","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27659"}],"summary":"Mattermost doesn't properly validate CSRF tokens in github.com/mattermost/mattermost-server"}