CVE-2026-45153

Nextcloud: PIN bypass in PassCodeActivity via back button

State: Published
Severity: 4.6 Medium
Published: Jun 1, 2026
Updated: Jun 1, 2026
Reserved: May 8, 2026

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.

Scores

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

Weaknesses

CWE-287 Improper Authentication

Affected Products

Product	Versions
security-advisoriesnextcloud	>= 33.0.0, < 33.1.0Affected

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

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