{"action":"No fix published. Pin and monitor.","affected":[{"introduced":"0"}],"component":"github.com/mattermost/mattermost-server/v6","cve_ids":["CVE-2026-2458"],"ecosystem":"Go","epss":0.00172,"exploited":false,"fixed_versions":[],"ghsa_id":"GHSA-679f-wmrg-qf57","id":"tcs_01M5KGFKQVQKCNQCKEMA27K26T","modified_at":"2026-03-23T18:45:15.030361Z","published_at":"2026-03-23T18:14:47Z","references":["https://osv.dev/vulnerability/GO-2026-4729","https://github.com/advisories/GHSA-679f-wmrg-qf57","https://nvd.nist.gov/vuln/detail/CVE-2026-2458","https://github.com/mattermost/mattermost/commit/a18b80ba4c324b74b3d47951c33957305af4a099","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GO-2026-4729#Go/github.com/mattermost/mattermost-server/v6","url":"https://osv.dev/vulnerability/GO-2026-4729"},{"source":"nvd","source_id":"CVE-2026-2458","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2458"}],"summary":"Mattermost allows a removed team member to enumerate all public channels within a private team in github.com/mattermost/mattermost-server"}