# CVE-2026-77169: Nextcloud Team Folders authorization bypass in workspace app

Source: https://junglewise.ai/threats/cve-2026-77169-nextcloud-team-folders-authorization-bypass-in-workspace-app  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-18. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-77169 · Severity: medium · CVSS 6.5 · Published 2026-09-18

Nextcloud's Team Folders app (formerly Group Folders) contains an authorization flaw when combined with the Workspace app that allows API/REST-only delegated administrators to access team folders beyond their assigned permissions. This bypasses folder-level access controls, potentially exposing sensitive team data to administrators who should not have full access to those folders.

Vendors: [Nextcloud](https://junglewise.ai/threats/vendors/nextcloud).

## Quick answers

**Is CVE-2026-77169 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77169 being exploited in the wild.

**How severe is CVE-2026-77169?** Medium severity, with a CVSS score of 6.5, published 18 September 2026.

**Which products and versions are affected?** Nextcloud Team Folders Unknown.

**Is there a fix for CVE-2026-77169?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-77169 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-77169?** Check whether you run Nextcloud Team Folders at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an authorization bypass in the Team Folders app when integrated with the Workspace app. Delegated administrators configured with API/REST-only privileges and limited folder access can circumvent these folder-level authorization controls through API calls, gaining access to folders they should not be able to manage. The workspace app is designed to restrict administrative privileges to specific folders via API/REST interfaces, but the implementation fails to properly enforce these restrictions. An authenticated API request from a delegated admin is sufficient to trigger the bypass; no special preconditions or user interaction is required.

## Affected products

- Nextcloud Team Folders Unknown

## Timeline

- 2026-09-18: disclosed

## References

- [https://hackerone.com/reports/3674940](https://hackerone.com/reports/3674940)