Vulnerability · Published Jun 1, 2026 · Assigned by GitHub_M
CVE-2026-45285Nextcloud: Hidden Public Link creation when sharing to a Team External Member
Medium 6.4
In plain English
A medium-severity missing authorization in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).
Official description
Nextcloud is an open source content collaboration platform. From versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, when a user shares a folder or file with a Nextcloud Team that includes an external member (a person added via email address who does not have a Nextcloud account), the system automatically creates a public link for that external member. This public link is not displayed in the share section of the folder, so the folder owner has no knowledge of its existence. It is sent via email to the external member. It grants the same permissions (read, write, delete, reshare, download) as the Team’s access. An attacker who receives or intercepts this link can access, modify, delete, reshare, and download all data in the shared folder without any further authentication. The folder owner cannot see or revoke the link through the normal sharing interface. This issue has been patched in versions 32.0.9 and 33.0.3.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nextcloud | security-advisories | >= 32.0.0, < 32.0.9>= 33.0.0, < 33.0.3 |
Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r3xh-x86g-hw4m x_refsource_CONFIRM
- https://github.com/nextcloud/circles/pull/2454 x_refsource_MISC
- https://hackerone.com/reports/3625932 x_refsource_MISC