What is CVE-2024-43438?

CVE-2024-43438 is a high-severity vulnerability in Moodle, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2024-11-07.

How severe is CVE-2024-43438?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Moodle

CVE-2024-43438

A flaw was found in Feedback. Bulk messaging in the activity's non-respondents report did not verify message recipients belonging to the set of users returned by the report.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2024-11-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.005 (42.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

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

Affected products

Moodle

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

bugzilla.redhat.com/show_bug.cgi (Permissions Required, issue-tracking)
moodle.org/mod/forum/discuss.php (Vendor Advisory)

Frequently asked questions

What is CVE-2024-43438?: CVE-2024-43438 is a high-severity vulnerability in Moodle, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2024-11-07.
How severe is CVE-2024-43438?: High severity. CVSS v3 base score is 7.5 out of 10.