{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.11+incompatible or later.","affected":[{"fixed":"10.11.11+incompatible","introduced":"10.11.0-rc1+incompatible"},{"fixed":"11.2.3+incompatible","introduced":"11.2.0-rc1+incompatible"},{"fixed":"11.3.2+incompatible","introduced":"11.3.0-rc1+incompatible"},{"fixed":"11.4.1+incompatible","introduced":"11.4.0+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-3115"],"ecosystem":"Go","epss":0.0024,"exploited":false,"fixed_versions":["10.11.11+incompatible","11.2.3+incompatible","11.3.2+incompatible","11.4.1+incompatible"],"ghsa_id":"GHSA-mpc7-mm28-f6wq","id":"tcs_01M5KGMX6E6R9AF0SY7RS7HJK6","modified_at":"2026-06-25T23:01:15.836610898Z","published_at":"2026-06-25T22:34:34Z","references":["https://osv.dev/vulnerability/GO-2026-5512","https://github.com/advisories/GHSA-mpc7-mm28-f6wq","https://nvd.nist.gov/vuln/detail/CVE-2026-3115","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GO-2026-5512","url":"https://osv.dev/vulnerability/GO-2026-5512"},{"source":"nvd","source_id":"CVE-2026-3115","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3115"}],"summary":"Mattermost allows authenticated guest users to enumerate user IDs outside their allowed visibility scope in github.com/mattermost/mattermost-server"}