CVE-2021-32658: Sensitive data may not be removed from storage on account removal

Severity: medium (CVSS 4.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-06-08 · updated 2026-06-17
Weakness: CWE-200

Description

Nextcloud Android is the Android client for the Nextcloud open source home cloud system. Due to a timeout issue the Android client may not properly clean all sensitive data on account removal. This could include sensitive key material such as the End-to-End encryption keys. It is recommended that the Nextcloud Android App is upgraded to 3.16.1

Affected products

com.nextcloud.client: before 3.16.1 — fixed in 3.16.1

How to fix

Upgrade to a fixed version: com.nextcloud.client 3.16.1. Check the vendor advisory for mitigations.

References

https://github.com/nextcloud/android/commit/355f3c745b464b741b20a3b96597303490c26333
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g5gf-rmhm-wpxw
https://hackerone.com/reports/1189168
https://github.com/nextcloud/android/commit/355f3c745b464b741b20a3b96597303490c26333
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g5gf-rmhm-wpxw
https://hackerone.com/reports/1189168

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