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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.

Critical CVSS 9.8 Listed in CISA KEV
CVECVE-2021-3199
First seen2026-10-08 19:01 UTC
Disclosed2021-01-26 18:16 UTC
Last updated2026-10-09 15:15 UTC
Channel statusauto

Summary

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.

In-depth triage

No in-depth report has been generated yet (DR-003 v2 AI pipeline is under construction).

Affected products

  • :
  • ONLYOFFICE:Docs

Sources

  • NVD DATABASE
  • CISA KEV DATABASE

Original Links

Timeline

  1. nvd_ingest NVD
  2. kev_ingest CISA KEV