Auth bypass in Moodle

CVE-2021-36400

In Moodle, insufficient capability checks made it possible to remove other users' calendar URL subscriptions.

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.005 (40.9th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-36400: held from 0.005 to 0.005.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

  • Moodle
  • 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-2021-36400?
CVE-2021-36400 is a medium-severity vulnerability in Moodle, classified under Incorrect Default Permissions. CVSS score: 5.3/10. Published 2023-03-06.
How severe is CVE-2021-36400?
Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2021-36400 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.