{"id":"CVE-2025-8402","aliases":["GHSA-h469-4fcf-p23h","GO-2025-3911"],"url":"https://o3.security/vulnerability/CVE-2025-8402","summary":"Nil pointer dereference in bulk import crashes server","details":"Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.0, 10.9.x <= 10.9.3 fail to validate import data which allows a system admin to crash the server via the bulk import feature.","published":"2025-08-21T17:01:43.420Z","modified":"2026-07-15T02:17:04.667695675Z","cvss":{"score":4.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00321,"percentile":0.24489,"asOf":"2026-08-07"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"10.8.4"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"10.5.9"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"10.9.4"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"10.10.1"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","fixedVersion":"8.0.0-20250708173752-d6b35c41f0ae5"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"9.11.18"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v5","fixedVersion":null},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v6","fixedVersion":null}],"fix":null,"references":[{"type":"WEB","url":"https://mattermost.com/security-updates"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/8xxx/CVE-2025-8402.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-8402"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T02:17:04.667695675Z"}}