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Medium, CVSS 5.4

Moodle reflected XSS via H5P error message

CVE-2024-43439GHSA-hjgc-jxjc-8v9j

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (moodle/moodle 4.4.2, 4.3.6, 4.2.9, 4.1.12), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Packagist moodle/moodle

    Affected
    < 4.1.12>= 4.2.0-beta, < 4.2.9>= 4.3.0-beta, < 4.3.6>= 4.4.0-beta, < 4.4.2
    Fixed in
    4.3.6, 4.1.12, 4.2.9, 4.4.2

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.4 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
EPSS
  • CVE-2024-43439: 0.35% estimated exploitation activity in the next 30 days; percentile 28.90 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-hjgc-jxjc-8v9j

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2024-43439

Advisory: Moodle reflected XSS via H5P error message
IDs: CVE-2024-43439, GHSA-hjgc-jxjc-8v9j
Record: https://patchnext.com/advisories/cve-2024-43439 (revision 1, source checked 26 Oct 2026, 14:31 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: moodle/moodle 4.4.2, 4.3.6, 4.2.9, 4.1.12. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist moodle/moodle: affected < 4.1.12; >= 4.2.0-beta, < 4.2.9; >= 4.3.0-beta, < 4.3.6; >= 4.4.0-beta, < 4.4.2; fixed in 4.3.6, 4.1.12, 4.2.9, 4.4.2

## Suggested inspection (read-only)
- Packagist moodle/moodle: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on moodle/moodle.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-hjgc-jxjc-8v9j (GitHub-reviewed advisory GHSA-hjgc-jxjc-8v9j lists affected ranges: Packagist moodle/moodle >=0 =4.2.0-beta =4.3.0-beta =4.4.0-beta <4.4.2)

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