What is CVE-2024-43439?

CVE-2024-43439 is a medium-severity vulnerability in Moodle, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2024-11-11.

How severe is CVE-2024-43439?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Moodle

CVE-2024-43439

A flaw was found in moodle. H5P error messages require additional sanitizing to prevent a reflected cross-site scripting (XSS) risk.

Vulnerability class: XSS (Cross-Site Scripting)

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

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (28.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Moodle

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

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-2024-43439?: CVE-2024-43439 is a medium-severity vulnerability in Moodle, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2024-11-11.
How severe is CVE-2024-43439?: Medium severity. CVSS v3 base score is 5.4 out of 10.