XSS in Moodle

CVE-2021-36401

In Moodle, ID numbers exported in HTML data formats required additional sanitizing to prevent a local stored XSS risk.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.005 (41.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

  • Moodle
  • N/a Moodle — versions 3.11, 3.10 to 3.10.4, 3.9 to 3.9.7 and earlier unsupported versions

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2021-36401?
CVE-2021-36401 is a medium-severity vulnerability in Moodle, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2023-03-06.
How severe is CVE-2021-36401?
Medium severity. CVSS v3 base score is 4.8 out of 10.
Is CVE-2021-36401 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.