CVE-2021-22906: Nextcloud End-To-End Encryption

Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days.

Nextcloud End-to-End Encryption before 1.5.3, 1.6.3 and 1.7.1 suffers from a denial of service vulnerability due to permitting any authenticated users to lock files of other users.

Affected products

• Nextcloud End-To-End Encryption: before 1.5.3 (fixed in 1.5.3); from 1.6.0, before 1.6.3 (fixed in 1.6.3); from 1.7.0, before 1.7.1 (fixed in 1.7.1)

Published 2021-06-11. Last modified 2026-06-17.