{"id":"CVE-2017-18904","aliases":["GHSA-8pff-p3gx-w4jf","GO-2026-4302"],"url":"https://o3.security/vulnerability/CVE-2017-18904","summary":" Mattermost Server vulnerable to XSS via an uploaded file","details":"An issue was discovered in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2. It allows XSS via an uploaded file.","published":"2020-06-19T19:15:11.763Z","modified":"2026-07-31T18:30:25.237791597Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"3.9.2"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"3.10.2"}],"fix":{"url":"https://github.com/mattermost/mattermost/commit/6a2754376c8c8270be5e11e3fdab589659d0cc8d","label":"mattermost/mattermost@6a27543"},"references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-18904"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/6a2754376c8c8270be5e11e3fdab589659d0cc8d"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/bde06a7bc3a03a56da224c1ffcd8bffb0af8071b"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/f06c5bef4d78966c60b153bbec6eea4ec0be9e68"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-31T18:30:25.237791597Z"}}