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CVE-2021-3199

ONLYOFFICE Docs Server Path Traversal Vulnerability

9.8
CVSS
30.2%
EPSS (exploit prob.)
98.2%
EPSS percentile
Yes
Actively exploited
No
Ransomware use
2026-10-08
Added
▲ +22.0 pts
24-day EPSS trend

Summary

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.

Affected software

Vendor: ONLYOFFICE  ·  Product: Docs

Weakness types (CWE):

CWE-22

What to do

This vulnerability appears in CISA's Known Exploited Vulnerabilities catalog, meaning it is being exploited in the wild. Prioritize patching affected systems and verify exposure across your estate.

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Sources: CISA KEV catalog · NVD · FIRST EPSS

This product uses the NVD API but is not endorsed or certified by the NVD.

All information is aggregated from public sources for awareness only and does not constitute an accusation or a security assessment. No personal data or credentials are published.