Vulnerability Details CVE-2021-27131
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).
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 33.2%
CVSS Severity
CVSS v3 Score 5.4
References
- https://docs.moodle.org/402/en/Risks
- https://github.com/moodle/moodle
- https://github.com/p4nk4jv/CVEs-Assigned/blob/master/Moodle-3.10.1-CVE-2021-27131.md
- https://docs.moodle.org/402/en/Risks
- https://github.com/moodle/moodle
- https://github.com/p4nk4jv/CVEs-Assigned/blob/master/Moodle-3.10.1-CVE-2021-27131.md