CVE-2021-27131

2023-05-1600:00:00

mitre

www.cve.org

moodle security vulnerability

cross-site scripting

input sanitization

5.6 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

29.1%

JSON

Moodle 3.10.1 is vulnerable to persistent/stored cross-site scripting (XSS) due to the improper input sanitization on the “Additional HTML Section” via “Header and Footer” parameter in /admin/settings.php. This vulnerability is leading an attacker to steal admin and all user account cookies by storing the malicious XSS payload in Header and Footer. NOTE: this is disputed by the vendor because the “Additional HTML Section” for “Header and Footer” can only be supplied by an administrator, who is intentionally allowed to enter unsanitized input (e.g., site-specific JavaScript).