This weekWhy this label: added to the catalog 18 days ago

CVE-2021-3199ONLYOFFICE Docs Server Path Traversal Vulnerability

Product: ONLYOFFICE Docs
Added to CISA KEV: October 8, 2026
Deadline for US federal agencies: October 11, 2026
Known ransomware use: Not known
EPSS, next 30 days: 30%, higher than 98% of scored CVEs (Oct 25, 2026)
Weakness: CWE-22

What CISA says

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.

What CISA asks you to do

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.

Sources

Also exploited recently

Data from CISA's Known Exploited Vulnerabilities catalog (public domain) and FIRST EPSS, refreshed hourly. Rheono did not find or test this vulnerability; this page summarizes public sources.