{"action":"Upgrade github.com/mattermost/mattermost-server to 9.11.18 or later.","affected":[{"fixed":"10.8.4","introduced":"10.8.0"},{"fixed":"10.5.9","introduced":"10.5.0"},{"fixed":"9.11.18","introduced":"9.11.0"},{"fixed":"10.9.3","introduced":"10.9.0"},{"fixed":"10.10.1","introduced":"10.10.0"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2025-49222"],"ecosystem":"Go","epss":0.00301,"exploited":false,"fixed_versions":["10.8.4","10.5.9","9.11.18","10.9.3","10.10.1"],"ghsa_id":"GHSA-q453-638c-h4mr","id":"tcs_01M5KFJ8E4WZRGBZ8DKGA510H2","modified_at":"2025-08-29T20:58:14Z","published_at":"2025-08-21T09:30:21Z","references":["https://osv.dev/vulnerability/GHSA-q453-638c-h4mr","https://nvd.nist.gov/vuln/detail/CVE-2025-49222","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates","https://pkg.go.dev/vuln/GO-2025-3904"],"severity":{"label":"medium","score":6.8},"sources":[{"source":"osv","source_id":"GHSA-q453-638c-h4mr","url":"https://osv.dev/vulnerability/GHSA-q453-638c-h4mr"}],"summary":"Mattermost Fails to Validate Remote Cluster Upload Sessions"}