CVE-2021-36400
Published: 06 March 2023
Summary
CVE-2021-36400 is a medium-severity Incorrect Default Permissions (CWE-276) vulnerability in Moodle Moodle. Its CVSS base score is 5.3 (Medium).
Operationally, ranked in the top 48.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-0844
Vulnerability details
In Moodle, insufficient capability checks made it possible to remove other users' calendar URL subscriptions.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Access control policy can specify and enforce secure default permissions for resources.
Per-request decision making makes it harder to bypass authorization using user-controlled keys without proper validation in the decision process.
Consistent enforcement of approved authorizations makes bypassing via user-controlled keys ineffective.
Guides setting of default permissions to the minimum required level.
Establishes requirements for appropriate default permissions on system resources as part of configuration management.
Baseline establishment and updates on install/upgrade ensure correct default permissions rather than insecure ones.
Requiring the most restrictive settings instead of defaults prevents incorrect default permissions on resources.
Requires documented processes that include setting and maintaining correct default permissions for configuration items.