{"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":"10.9.4","introduced":"10.9.0"},{"fixed":"10.10.1","introduced":"10.10.0"},{"fixed":"9.11.18","introduced":"9.11.0"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2025-8402"],"ecosystem":"Go","epss":0.00321,"exploited":false,"fixed_versions":["10.8.4","10.5.9","10.9.4","10.10.1","9.11.18"],"ghsa_id":"GHSA-h469-4fcf-p23h","id":"tcs_01M5KFBV8JARJYPB2Q84VKRDQQ","modified_at":"2025-08-29T21:02:12Z","published_at":"2025-08-21T18:31:29Z","references":["https://osv.dev/vulnerability/GHSA-h469-4fcf-p23h","https://nvd.nist.gov/vuln/detail/CVE-2025-8402","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates","https://pkg.go.dev/vuln/GO-2025-3911"],"severity":{"label":"medium","score":4.9},"sources":[{"source":"osv","source_id":"GHSA-h469-4fcf-p23h","url":"https://osv.dev/vulnerability/GHSA-h469-4fcf-p23h"}],"summary":"Mattermost has Potential Server Crash due to Unvalidated Import Data"}