CVE-2026-77169: CWE-284 Improper Access Control - Generic in Nextcloud Team Folders
A vulnerability in the team folders (formerly group folders) app when used in combination with the workspace app allowed API/REST-only delegated administrators to bypass folder-level authorization controls. The workspace app enables organizations to delegate limited administrative privileges for team folder management via API/REST only, restricting access to folders for which the admin has advanced permissions.
AI Analysis
Technical Summary
The vulnerability exists in the Nextcloud Team Folders app when used with the workspace app, which delegates limited administrative privileges via API/REST. Due to improper access control (CWE-284), delegated administrators with API/REST-only access can bypass folder-level authorization restrictions, potentially gaining unauthorized access to team folders. The issue affects versions from 13.0.0 up to but not including 22.0.0. The CVSS 3.0 base score is 6.5, indicating a medium severity with high impact on confidentiality and integrity but no impact on availability.
Potential Impact
An attacker with delegated administrative privileges via API/REST can bypass folder-level authorization controls, potentially accessing sensitive data in team folders they should not have permission to access. This compromises confidentiality and integrity of the data stored in affected folders. There is no indication of impact on availability. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, organizations should review delegated administrator privileges carefully and restrict API/REST access to trusted personnel only. Monitoring and limiting the use of the workspace app's delegated admin functionality can reduce risk.
CVE-2026-77169: CWE-284 Improper Access Control - Generic in Nextcloud Team Folders
Description
A vulnerability in the team folders (formerly group folders) app when used in combination with the workspace app allowed API/REST-only delegated administrators to bypass folder-level authorization controls. The workspace app enables organizations to delegate limited administrative privileges for team folder management via API/REST only, restricting access to folders for which the admin has advanced permissions.
CVSS v3.0
Score 6.5medium
Affected software
Nextcloud
Team Folders
pkg:github/nextcloud/team-foldersRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability exists in the Nextcloud Team Folders app when used with the workspace app, which delegates limited administrative privileges via API/REST. Due to improper access control (CWE-284), delegated administrators with API/REST-only access can bypass folder-level authorization restrictions, potentially gaining unauthorized access to team folders. The issue affects versions from 13.0.0 up to but not including 22.0.0. The CVSS 3.0 base score is 6.5, indicating a medium severity with high impact on confidentiality and integrity but no impact on availability.
Potential Impact
An attacker with delegated administrative privileges via API/REST can bypass folder-level authorization controls, potentially accessing sensitive data in team folders they should not have permission to access. This compromises confidentiality and integrity of the data stored in affected folders. There is no indication of impact on availability. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, organizations should review delegated administrator privileges carefully and restrict API/REST access to trusted personnel only. Monitoring and limiting the use of the workspace app's delegated admin functionality can reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- hackerone
- Date Reserved
- 2026-08-20T15:00:00.606Z
- Cvss Version
- 3.0
- State
- PUBLISHED
Threat ID: 6aad953b55bf5e2cf577b8a6
Added to database: 09/18/2026, 19:47:07 UTC
Last enriched: 09/18/2026, 20:02:23 UTC
Last updated: 09/19/2026, 02:25:36 UTC
Views: 6
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