{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.15+incompatible or later.","affected":[{"fixed":"10.11.15+incompatible","introduced":"10.11.0+incompatible"},{"fixed":"11.4.5+incompatible","introduced":"11.4.0+incompatible"},{"fixed":"11.5.4+incompatible","introduced":"11.5.0+incompatible"},{"fixed":"11.6.1+incompatible","introduced":"11.6.0+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-4858"],"ecosystem":"Go","epss":0.00327,"exploited":false,"fixed_versions":["10.11.15+incompatible","11.4.5+incompatible","11.5.4+incompatible","11.6.1+incompatible"],"ghsa_id":"GHSA-c4r7-j7pp-r8mp","id":"tcs_01M5KGKDBD73KH53H4R07NMRFJ","modified_at":"2026-06-25T19:45:28.286607182Z","published_at":"2026-06-25T18:43:19Z","references":["https://osv.dev/vulnerability/GO-2026-5311","https://github.com/advisories/GHSA-c4r7-j7pp-r8mp","https://nvd.nist.gov/vuln/detail/CVE-2026-4858","https://mattermost.com/security-updates"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"GO-2026-5311","url":"https://osv.dev/vulnerability/GO-2026-5311"}],"summary":"Mattermost has a Path Traversal issue in github.com/mattermost/mattermost-server"}