CVE-2026-45153: CWE-287: Improper Authentication in nextcloud security-advisories
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.
AI Analysis
Technical Summary
Nextcloud Files app versions 33.0.0 to before 33.1.0 contain an improper authentication vulnerability (CWE-287) on Android devices. After unlocking a locked phone, an attacker can bypass the app's PIN protection by pressing the back button, potentially gaining unauthorized access to files. This issue was fixed in version 33.1.0.
Potential Impact
The vulnerability allows an attacker with physical access to an unlocked Android device to bypass the Nextcloud Files app PIN, potentially exposing sensitive files. The CVSS score of 4.6 indicates a medium impact primarily on confidentiality, with limited impact on integrity and no impact on availability.
Mitigation Recommendations
Upgrade Nextcloud Files app to version 33.1.0 or later, where this authentication bypass issue has been patched. No other mitigation is indicated or required.
CVE-2026-45153: CWE-287: Improper Authentication in nextcloud security-advisories
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.
CVSS v3.1
Score 4.6medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Nextcloud Files app versions 33.0.0 to before 33.1.0 contain an improper authentication vulnerability (CWE-287) on Android devices. After unlocking a locked phone, an attacker can bypass the app's PIN protection by pressing the back button, potentially gaining unauthorized access to files. This issue was fixed in version 33.1.0.
Potential Impact
The vulnerability allows an attacker with physical access to an unlocked Android device to bypass the Nextcloud Files app PIN, potentially exposing sensitive files. The CVSS score of 4.6 indicates a medium impact primarily on confidentiality, with limited impact on integrity and no impact on availability.
Mitigation Recommendations
Upgrade Nextcloud Files app to version 33.1.0 or later, where this authentication bypass issue has been patched. No other mitigation is indicated or required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-08T20:44:38.964Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1dbba3e29bf47b501c57ab
Added to database: 6/1/2026, 5:04:35 PM
Last enriched: 6/1/2026, 5:20:55 PM
Last updated: 6/2/2026, 5:03:06 AM
Views: 5
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