HIGH CISA-KEV ACTIVELY EXPLOITED
CVE-2021-3199
ONLYOFFICE Docs Server Path Traversal Vulnerability
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 Products
- ONLYOFFICE: Docs
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-3199
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog
This high severity vulnerability was published on 2026-10-08 via CISA-KEV. ⚠ This vulnerability is in the CISA Known Exploited Vulnerabilities (KEV) catalog — it is being actively exploited in the wild. EPSS score: 19.4% (top 3% of all CVEs by exploitation probability). Affected: ONLYOFFICE: Docs.
Risk Timeline
CVE Disclosed2026-10-08 · 4 days ago
CISA KEV — Actively ExploitedU.S. federal agencies required to patch · confirmed threat-actor activity
Remediation Resources
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