CVE-2021-41166

Permission bypass in Nextcloud Android App

MEDIUM
5.3
CVSS Score
Published: January 26, 2022 at 10:35 PM UTC
Updated: June 17, 2026 at 04:08 AM UTC
1 product affected across 1 vendorNextcloud/server

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.9%
SSVC
No known exploit

Description

The Nextcloud Android app is the Android client for Nextcloud, a self-hosted productivity platform. An issue in versions prior to 3.17.1 may lead to sensitive information disclosure. An unauthorized app that does not have the otherwise required `MANAGE_DOCUMENTS` permission may view image thumbnails for images it does not have permission to view. Version 3.17.1 contains a patch. There are no known workarounds.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 3.17.1
Affected range stops below 3.17.1, so it looks safe — our inference, not a vendor statement

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-276

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