Nextcloud: PIN bypass in PassCodeActivity via back button

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Summary

CVECVE-2026-45153
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-01 17:17:08 UTC
Updated2026-06-01 18:14:29 UTC
DescriptionNextcloud 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.

Risk And Classification

Primary CVSS: v3.1 4.6 MEDIUM from [email protected]

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

Problem Types: CWE-287 | CWE-287 CWE-287: Improper Authentication

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.6MEDIUMCVSS:3.1/AV:P/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N
3.1CNADECLARED4.6MEDIUMCVSS:3.1/AV:P/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nextcloud Security-advisories affected >= 33.0.0, < 33.1.0 Not specified

References

ReferenceSourceLinkTags
github.com/nextcloud/security-advisories/security/advisories/GHSA-2w7v-5... [email protected] github.com
github.com/nextcloud/android/pull/16896 [email protected] github.com
hackerone.com/reports/3625210 [email protected] hackerone.com
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