ONLYOFFICE Docs Server Path Traversal Vulnerability
This vulnerability is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it. If you run Docs, fix it now.
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.
US federal civilian agencies must remediate by Oct 11, 2026.
No official fix confirmed yet
Until a fix ships, follow the vendor's mitigations and CISA's required action, limit exposure of affected systems, and watch this record for a patch.
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.
Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.
| Product | Vendor | Source |
|---|---|---|
| Docs | ONLYOFFICE | KEV |
Sources: KEV = CISA Known Exploited Vulnerabilities catalog. Version details have not been published yet.
Developments from the last 30 days, newest first.
CVE-2021-3199 scored CVSS 9.8: ONLYOFFICE Docs, ONLYOFFICE Docs Server Path Traversal Vulnerability
CISA lists this as exploited in the wild. Unpatched Docs systems are exposed to active attacks now.
Basis: NIST National Vulnerability Database
CVE-2021-3199 added to CISA KEV: ONLYOFFICE Docs, ONLYOFFICE Docs Server Path Traversal Vulnerability
CISA lists this as exploited in the wild. Unpatched Docs systems are exposed to active attacks now.
Basis: CISA Known Exploited Vulnerabilities catalog
CISA lists this as exploited in the wild. Unpatched Docs systems are exposed to active attacks now.
Treat this as an emergency.
CISA lists this as exploited in the wild and known to be used in ransomware campaigns. Unpatched Exchange Server and Struts systems are exposed to active attacks now.
Treat this as an emergency.
