CVE-2021-27131: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

May 16, 2023 (updated November 7, 2023)

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.

References

github.com/advisories/GHSA-w2pm-fr62-jgv4
github.com/moodle/moodle
github.com/p4nk4jv/CVEs-Assigned/blob/master/Moodle-3.10.1-CVE-2021-27131.md
nvd.nist.gov/vuln/detail/CVE-2021-27131

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