Description
user/index.php in Moodle through 2.6.11, 2.7.x before 2.7.13, 2.8.x before 2.8.11, 2.9.x before 2.9.5, and 3.0.x before 3.0.3 grants excessive authorization on the basis of the moodle/course:viewhiddenuserfields capability, which allows remote authenticated users to discover student e-mail addresses by leveraging the teacher role and reading a Participants list.
Remediation
References
Related Vulnerabilities
Joomla! Core 3.2.x Cross-Site Scripting (3.2.0 - 3.2.4)
TYPO3 Deserialization of Untrusted Data Vulnerability (CVE-2019-19849)
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WordPress Plugin Login/Signup Popup (Inline Form + Woocommerce) Security Bypass (2.7.2)