CVE-2020-13667 — core
MEDIUMCVE-2020-13667 is a medium-severity (CVSS 5.3) Incorrect Default Permissions vulnerability in drupal/core. A fix is available for drupal/core — see the affected versions and patch details below.
Drupal Core Access bypass vulnerability
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
drupal/core🐘drupal/core🐘drupal/core🐘drupal/drupal🐘drupal/drupal🐘drupal/drupalReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
Access bypass vulnerability in of Drupal Core Workspaces allows an attacker to access data without correct permissions. The Workspaces module doesn't sufficiently check access permissions when switching workspaces, leading to an access bypass vulnerability. An attacker might be able to see content before the site owner intends people to see the content. This vulnerability is mitigated by the fact that sites are only vulnerable if they have installed the experimental Workspaces module. This issue affects Drupal Core8.8.X versions prior to 8.8.10; 8.9.X versions prior to 8.9.6; 9.0.X versions prior to 9.0.6.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | drupal/core | ≥ 8.8.0&&< 8.8.10 | 8.8.10composer require drupal/core:^8.8.10 |
| 🐘Packagist | drupal/core | ≥ 8.9.0&&< 8.9.6 | 8.9.6composer require drupal/core:^8.9.6 |
| 🐘Packagist | drupal/core | ≥ 9.0.0&&< 9.0.6 | 9.0.6composer require drupal/core:^9.0.6 |
| 🐘Packagist | drupal/drupal | ≥ 8.8.0&&< 8.8.10 | 8.8.10composer require drupal/drupal:^8.8.10 |
| 🐘Packagist | drupal/drupal | ≥ 8.9.0&&< 8.9.6 | 8.9.6composer require drupal/drupal:^8.9.6 |
| 🐘Packagist | drupal/drupal | ≥ 9.0.0&&< 9.0.6 | 9.0.6composer require drupal/drupal:^9.0.6 |
Affected Products
drupaldrupalDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for drupal/core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update drupal/core to 8.8.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-13667 is resolved across your whole dependency graph.
Workarounds
Close the privilege gap rather than the entry point: audit which accounts, roles and service identities can reach the affected operation, drop the component to the least privilege it actually needs, and review file and directory permissions created by earlier installs — a default left in place is what makes this reachable.
Frequently Asked Questions
Is CVE-2020-13667 in your dependencies?
Find it across Packagist, including transitive dependencies.