CVE-2021-43560 : What You Need to Know

A flaw in Moodle versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 allowed unauthorized access to users' calendar events.

Understanding CVE-2021-43560

What is CVE-2021-43560?

The CVE-2021-43560 vulnerability in Moodle versions revealed a security flaw enabling the retrieval of other users' calendar events due to inadequate capability checks.

The Impact of CVE-2021-43560

The vulnerability could lead to unauthorized access to sensitive calendar data, compromising user privacy and potentially causing data breaches.

Technical Details of CVE-2021-43560

Vulnerability Description

The flaw in Moodle versions 3.9 to 3.11.3 allowed users to access calendar events of other users without proper authorization, posing a significant security risk.

Affected Systems and Versions

Affected Versions: Moodle 3.11.4, Moodle 3.10.8, Moodle 3.9.11, and prior unsupported versions

Exploitation Mechanism

Unauthorized users could exploit insufficient capability checks to access and retrieve calendar action events of other users within the Moodle platform.

Mitigation and Prevention

Immediate Steps to Take

Users should update Moodle to the latest version immediately to mitigate the vulnerability.
Review and restrict user permissions to prevent unauthorized access to sensitive calendar information.

Long-Term Security Practices

Regularly review and update system permissions and access controls.
Conduct security audits to identify and address potential vulnerabilities proactively.

Patching and Updates

It is crucial to stay informed about Moodle security updates and apply patches promptly to address known vulnerabilities.