Nextcloud server is an open source personal cloud product. Affected versions of this package are vulnerable to Information Exposure which fails to strip the Authorization header on HTTP downgrade. This can lead to account access exposure and compromise. It is recommended that the Nextcloud Server is upgraded to 23.0.7 or 24.0.3. It is recommended that the Nextcloud Enterprise Server is upgraded to 22.2.11, 23.0.7 or 24.0.3. There are no known workarounds for this issue.
The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
Name | Vendor | Start Version | End Version |
---|---|---|---|
Nextcloud_enterprise_server | Nextcloud | * | 22.2.11 (excluding) |
Nextcloud_enterprise_server | Nextcloud | 23.0.0 (including) | 23.0.7 (excluding) |
Nextcloud_enterprise_server | Nextcloud | 24.0.0 (including) | 24.0.3 (excluding) |
Nextcloud_server | Nextcloud | * | 23.0.7 (excluding) |
Nextcloud_server | Nextcloud | 24.0.0 (including) | 24.0.3 (excluding) |
Assuming a user with a given identity, authorization is the process of determining whether that user can access a given resource, based on the user’s privileges and any permissions or other access-control specifications that apply to the resource. When access control checks are incorrectly applied, users are able to access data or perform actions that they should not be allowed to perform. This can lead to a wide range of problems, including information exposures, denial of service, and arbitrary code execution.