Description
Moodle 2.1.x before 2.1.6 and 2.2.x before 2.2.3 allows remote authenticated users to bypass the moodle/site:readallmessages capability requirement and read arbitrary messages by using the "Recent conversations" feature with a modified parameter in a URL.
Remediation
References
Related Vulnerabilities
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WordPress Plugin Connections Business Directory Cross-Site Scripting (8.5.8)
LimeSurvey Incorrect Default Permissions Vulnerability (CVE-2019-16185)