{"action":"No fix published. Pin and monitor.","affected":[{"introduced":"0"}],"component":"github.com/mattermost/mattermost-server/v6","cve_ids":["CVE-2026-6333"],"ecosystem":"Go","epss":0.00137,"exploited":false,"fixed_versions":[],"ghsa_id":"GHSA-vqp5-2mrp-qqxg","id":"tcs_01M5KGP29HR31947JCZWSDP4YB","modified_at":"2026-06-25T23:01:38.693940001Z","published_at":"2026-06-25T22:34:38Z","references":["https://osv.dev/vulnerability/GO-2026-5671","https://github.com/advisories/GHSA-vqp5-2mrp-qqxg","https://nvd.nist.gov/vuln/detail/CVE-2026-6333","https://github.com/mattermost/mattermost/commit/e738016c592045e14bf926eafaeda6f8521def6d","https://mattermost.com/security-updates"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"GO-2026-5671#Go/github.com/mattermost/mattermost-server/v6","url":"https://osv.dev/vulnerability/GO-2026-5671"}],"summary":"Mattermost doesn't validate the Host header when constructing response URLs for custom slash command in github.com/mattermost/mattermost-server"}