Stored cross-site scripting in Moodle - CVE-2021-20279
Published: March 15, 2021
Vulnerability identifier: #VU51476
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2021-20279
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The disclosed vulnerability allows a remote user to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data passed via the ID number user profile field. A remote user can inject and and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
Affected software
Moodle
Fedora
moodle
Fedora
moodle
How to mitigate CVE-2021-20279
Install updates from vendor's website.
Moodle - addressed in versions 3.5.17, 3.8.8, 3.9.5, 3.10.2
moodle - addressed in versions 3.8.8-1.fc32, 3.9.5-1.fc33, 3.10.2-1.fc34
moodle - addressed in versions 3.8.8-1.fc32, 3.9.5-1.fc33, 3.10.2-1.fc34