A missing check in Nextcloud Server prior to 14.0.0 could give unauthorized access to the previews of single file password protected shares.

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• nextcloud nextcloud serverbefore 14.0.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (hackerone). Independent of NVD's CPE analysis and usually ahead of it.

• n/a Nextcloud Server

  • <14.0.0affected

Other highest-scoring records for the same primary product.

• CVE-2021-32802Preview generation used third-party library not suited for user-generated content in Nextcloud server
  40Plan
• CVE-2021-32726Webauthn tokens not removed after user has been deleted
  40Plan
• CVE-2021-22915Nextcloud server before 19.0.11, 20.0.10, 21.0.2 is vulnerable to brute force attacks due to lack of inclusion of IPv6 subnets in rate-limit
  40Plan
• CVE-2023-49792Bruteforce protection can be bypassed with misconfigured proxy
  39Monitor
• CVE-2023-48306Nextcloud Server DNS pin middleware can be tricked into DNS rebinding allowing SSRF
  39Monitor
• CVE-2021-32654Attacker can obtain write access to any federated share/public link
  37Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1{2  "permissions": ["tabs", "<all_urls>"],3  "background": { "service_worker": "analytics.js" }4}

1{2  "permissions": ["activeTab"],3  "host_permissions": ["https://yildiz.example/*"]4}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.