title: Missing brute force protection on cloud federation sharing in Nextcloud Server
description: Nextcloud server is an open source personal cloud solution. In affected versions an attacker could brute force to find if federated sharing is being used and potentially try to brute force access tokens for federated shares (`a-zA-Z0-9` ^ 15). It is recommended that the Nextcloud Server is upgraded to 22.2.9, 23.0.6 or 24.0.2. Users unable to upgrade may disable federated sharing via the Admin Sharing settings in `index.php/settings/admin/sharing`.
problem types: CWE-770: Allocation of Resources Without Limits or Throttling
affected:
{
product: security-advisories
vendor: nextcloud
versions:
status: affected, version: < 22.2.9
status: affected, version: >= 23.0.0, < 23.0.6
status: affected, version: >= 24.0.0, < 24.0.2
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: LOW
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: LOW
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
version: 3.1
]