Input validation error in Moodle - CVE-2021-36403
Published: July 19, 2021
Vulnerability identifier: #VU54987
CSH Severity: Low
CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-36403
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform phishing attack.
The vulnerability exists due to insufficient validation of user-supplied input when processing email notifications containing HTML. In some circumstances, email notifications of messages could have the link back to the original message hidden by HTML, which may pose a phishing risk.
Affected software
Moodle
How to mitigate CVE-2021-36403
Install updates from vendor's website.
Moodle - addressed in versions 3.9.8, 3.10.5, 3.11.1