Vulnerability in Moodle

CVE-2021-36403

In Moodle, in some circumstances, email notifications of messages could have the link back to the original message hidden by HTML, which may pose a phishing risk.

EPSS: 0.005 (41.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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-2021-36403?
CVE-2021-36403 is a medium-severity vulnerability in Moodle, classified under Hidden Functionality. CVSS score: 5.3/10. Published 2023-03-06.
How severe is CVE-2021-36403?
Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2021-36403 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.