Live › vulnerability › CVE-2021-3199
Go to dashboardPath traversal in ONLYOFFICE Document Server's /upload image handling (a /.. sequence in an image upload parameter) leads to remote code execution when JWT is enabled. NVD scores it 9.8 (network, no privileges, no user interaction). It is in the CISA KEV catalog. The fix shipped in 5.6.3, released in 2020, so any current install should already be past it. Only very old or unmaintained instances are at risk.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| ONLYOFFICE Docs | vendor | – | – |
| ONLYOFFICE Document Server | vendor | < 5.6.3 | 5.6.3 |
curl http://<host>/hosting/discovery, or on Linux run dpkg -l onlyoffice-documentserver or rpm -q onlyoffice-documentserverdocker inspect on the image tag5.6.3 is vulnerablewhen JWT is used; JWT settings are in local.json/default.json under services.CoAuthoring.token5.6.3 or laterEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
ONLYOFFICE Docs contains a path traversal vulnerability that can occur when JWT is used, via a /.. sequence in an image upload parameter and could allow for remote code execution.
CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
This page as .md · .json · in your agent: get_signal("CVE-2021-3199")
CISA KEV catalog, Creative Commons 0 · NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.