{"id":"CVE-2021-3199","aliases":[],"url":"https://o3.security/vulnerability/CVE-2021-3199","summary":null,"details":"Directory traversal with remote code execution can occur in /upload in ONLYOFFICE Document Server before 5.6.3, when JWT is used, via a /.. sequence in an image upload parameter.","published":"2021-01-26T18:16:28.507Z","modified":"2026-08-07T16:57:21.717127Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563"},{"type":"EVIDENCE","url":"https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py"},{"type":"EVIDENCE","url":"https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T16:57:21.717127Z"}}