CVE-2025-66547
BaseFortify
Publication date: 2025-12-05
Last updated on: 2025-12-09
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| nextcloud | nextcloud_server | From 31.0.0 (inc) to 31.0.1 (exc) |
| nextcloud | nextcloud_server | From 31.0.0 (inc) to 31.0.1 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-639 | The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability in Nextcloud Server and Enterprise Server prior to version 31.0.1 allows non-privileged users to modify tags on files they should not have access to by using bulk tagging. This means users without proper permissions can change metadata tags on files, potentially affecting file organization or access control.
How can this vulnerability impact me? :
The vulnerability can impact you by allowing unauthorized users to alter file tags, which may lead to confusion, misclassification, or improper handling of files. Although it does not allow direct access to file contents or cause data loss, it can undermine file management and integrity within the system.
What immediate steps should I take to mitigate this vulnerability?
Upgrade Nextcloud Server or Enterprise Server to version 31.0.1 or later, as this version contains the fix for the vulnerability allowing non-privileged users to modify tags on files they should not have access to.