Description
The error-message functionality in Moodle 1.9.x before 1.9.13, 2.0.x before 2.0.4, and 2.1.x before 2.1.1 does not ensure that a continuation link refers to an http or https URL for the local Moodle instance, which might allow attackers to trick users into visiting arbitrary web sites via unspecified vectors.
Remediation
References
Related Vulnerabilities
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Oracle HTTP Server Out-of-bounds Read Vulnerability (CVE-2019-3823)
Oracle Database Server CVE-2015-0479 Vulnerability (CVE-2015-0479)