What’s Vulnerable › Vulnerabilities

CVE-2023-28646: App lockout in nextcloud Android app can be bypassed via thirdparty apps

• Severity: low (CVSS 2.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-03-30 · updated 2026-06-17
• Weakness: CWE-281

Description

Nextcloud android is an android app for interfacing with the nextcloud home server ecosystem. In versions from 3.7.0 and before 3.24.1 an attacker that has access to the unlocked physical device can bypass the Nextcloud Android Pin/passcode protection via a thirdparty app. This allows to see meta information like sharer, sharees and activity of files. It is recommended that the Nextcloud Android app is upgraded to 3.24.1. There are no known workarounds for this vulnerability.

Affected products

• com.nextcloud.client: from 3.7.0 before 3.24.1 — fixed in 3.24.1

How to fix

Upgrade to a fixed version: com.nextcloud.client 3.24.1. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/android/pull/11242
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-c3rf-94h6-vj8v
• https://github.com/nextcloud/android/pull/11242
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-c3rf-94h6-vj8v

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