CVE-2021-43863: Nextcloud

High severity, CVSS 7.5. EPSS: 1.9% chance of exploitation in the next 30 days.

The Nextcloud Android app is the Android client for Nextcloud, a self-hosted productivity platform. The Nextcloud Android app uses content providers to manage its data. Prior to version 3.18.1, the providers `FileContentProvider` and `DiskLruImageCacheFileProvider` have security issues (an SQL injection, and an insufficient permission control, respectively) that allow malicious apps in the same device to access Nextcloud's data bypassing the permission control system. Users should upgrade to version 3.18.1 to receive a patch. There are no known workarounds aside from upgrading.

Affected products

• Nextcloud Nextcloud: before 3.18.1 (fixed in 3.18.1)

Published 2022-01-25. Last modified 2026-06-17.