CVE-2021-43445: ONLYOFFICE Server

Critical severity, CVSS 9.8. EPSS: 1.7% chance of exploitation in the next 30 days.

ONLYOFFICE all versions as of 2021-11-08 is affected by Incorrect Access Control. An attacker can authenticate with the web socket service of the ONLYOFFICE document editor which is protected by JWT auth by using a default JWT signing key.

Affected products

• ONLYOFFICE Server: up to and including 7.0.0.49

Published 2023-01-23. Last modified 2026-06-17.