{"action":"Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260217110922-b7d4a1f1f59b or later.","affected":[{"fixed":"11.4.1","introduced":"11.4.0"},{"fixed":"11.3.2","introduced":"11.3.0-rc1"},{"fixed":"11.2.3","introduced":"11.2.0-rc1"},{"fixed":"10.11.11","introduced":"10.11.0-rc1"},{"fixed":"8.0.0-20260217110922-b7d4a1f1f59b","introduced":"8.0.0-20260105080200-d27a2195068d"}],"component":"github.com/mattermost/mattermost/server/v8","cve_ids":["CVE-2026-3115"],"ecosystem":"Go","epss":0.0024,"exploited":false,"fixed_versions":["11.4.1","11.3.2","11.2.3","10.11.11","8.0.0-20260217110922-b7d4a1f1f59b"],"ghsa_id":"GHSA-mpc7-mm28-f6wq","id":"tcs_01M5KFG3HQ0YFEK5TED2A3DGD7","modified_at":"2026-06-25T23:11:15.146322253Z","published_at":"2026-03-26T18:31:42Z","references":["https://osv.dev/vulnerability/GHSA-mpc7-mm28-f6wq","https://nvd.nist.gov/vuln/detail/CVE-2026-3115","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GHSA-mpc7-mm28-f6wq","url":"https://osv.dev/vulnerability/GHSA-mpc7-mm28-f6wq"}],"summary":"Mattermost allows authenticated guest users to enumerate user IDs outside their allowed visibility scope"}