CVE-2026-45153 Nextcloud: PIN bypass in PassCodeActivity via back button
Attackers can bypass the Nextcloud Files app PIN on Android by pressing the back button after unlocking the device.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45153?
CVE-2026-45153 is a medium-severity authentication bypass vulnerability in nextcloud security-advisories, published on 1 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Nextcloud is an open source content collaboration platform. From version 33.0.0 to before version 33.1.0, after unlocking a locked Android phone the back-button could be used to bypass the Nextcloud Files app PIN. This issue has been patched in version 33.1.0.
Weakness: CWE-287
Which versions are affected by CVE-2026-45153?
1 open source package ship an affected version, including nextcloud.
| Package | Affected | Fixed in |
|---|---|---|
nextcloud Bitnami | From 33.0.0 | 33.1.0 |
How do I fix CVE-2026-45153?
Upgrade nextcloud to 33.1.0 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-45153 being exploited?
There is no known exploitation of CVE-2026-45153 in the wild and no public exploit code.
Sources
Also known as BIT-nextcloud-2026-45153, GHSA-2w7v-5299-3hw5.