[悪用確認] CVE-2021-3199: ONLYOFFICE Docs Server Path Traversal Vulnerability

ONLYOFFICE Docs 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. 対応: 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. (期限 2026-10-11)

Read on CISA Known Exploited Vulnerabilities

On 10/08/2026, 09:00 AM, CISA Known Exploited Vulnerabilities published "[悪用確認] CVE-2021-3199: ONLYOFFICE Docs Server Path Traversal Vulnerability" (type: Advisory). Severity is "Critical" (critical). CVE: CVE-2021-3199.