CVE-2026-45153 PUBLISHED

Nextcloud: PIN bypass in PassCodeActivity via back button

Assigner: GitHub_M
Reserved: 08.05.2026 Published: 01.06.2026 Updated: 01.06.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:P/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N
CVSS Score: 4.6

Attack Vector	Physical	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	Low
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	nextcloud
Product	security-advisories
Versions	Version >= 33.0.0, < 33.1.0 is affected

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2w7v-5299-3hw5
https://github.com/nextcloud/android/pull/16896
https://hackerone.com/reports/3625210

Problem Types

CWE-287: Improper Authentication CWE