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CVE

CVE-2021-41241

Nextcloud server is a self hosted system designed to provide cloud style services. The groupfolders application for Next

Nextcloud server is a self hosted system designed to provide cloud style services. The groupfolders application for Nextcloud allows sharing a folder with a group of people. In addition, it allows setting "advanced permissions" on subfolders, for example, a user could be granted access to the groupfolder but not specific subfolders.

Due to a lacking permission check in affected versions, a user could still access these subfolders by copying the groupfolder to another location. It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1. Users unable to upgrade should disable the "groupfolders" application in the admin settings.

MEDIUM · CVSS 4.3 EPSS 0.00233
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-862Missing Authorization
CWE-863Incorrect Authorization
▤

Affected Products & Versions

3
nextcloud server< 20.0.14
nextcloud server>= 21.0.0 and < 21.0.6
nextcloud serverall versions
▣

Scoring & Timeline

4.3
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 Mar 2022 · 07:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

2
suse-csafopenSUSE-SU-2022:0098-1
suse-csafopenSUSE-SU-2022:0089-1
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/nextcloud/groupfolders/issues/1692Issue TrackingPatchThird Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m4wp-r357-4q94Issue TrackingThird Party Advisory
https://github.com/nextcloud/server/pull/29362PatchThird Party Advisory
https://security.gentoo.org/glsa/202208-17Third Party Advisory
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