CVE-2024-43439Network attack vector

JavaScript execution via unescaped H5P error templates

Published Nov 11, 2024 · Updated Nov 12, 2024

Reflected XSS in Moodle LMS allows remote attackers to execute JavaScript through a crafted H5P error-message URL. The h5p/templates/h5perror.mustache template uses raw Mustache interpolation for exception, info, code, and message values, causing double URL-encoded input to render as executable markup. Affected versions are 4.1.11 and earlier, 4.2.0 through 4.2.8, 4.3.0 through 4.3.5, and 4.4.0 through 4.4.1; execution requires a victim to follow the crafted link.

CVSS severity5.4
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Moodle LMS allows remote attackers to execute JavaScript through a crafted H5P error-message URL. The h5p/templates/h5perror.mustache template uses raw Mustache interpolation for exception, info, code, and message values, causing double URL-encoded input to render as executable markup. Affected versions are 4.1.11 and earlier, 4.2.0 through 4.2.8, 4.3.0 through 4.3.5, and 4.4.0 through 4.4.1; execution requires a victim to follow the crafted link.

The record

CVE
CVE-2024-43439
Published
Nov 11, 2024
Updated
Nov 12, 2024
Vendor
Moodle
Product
Moodle LMS
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 11, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 12, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <4.1.12
  2. Affected versionversion=4.2 <4.2.9
  3. Affected versionversion=4.3 <4.3.6
  4. Affected versionversion=4.4 <4.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Moodle · Moodle LMSversion=0 <4.1.12; version=4.2 <4.2.9; version=4.3 <4.3.6; version=4.4 <4.4.2

Published CVSS scores

5.4Fedora ProjectCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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