CVE-2024-33998Network attack vector

Stored XSS via unescaped participant names

Published May 31, 2024 · Updated Mar 28, 2025

Stored XSS in Moodle LMS 4.3.3 and earlier allows remote authenticated users to execute script in another user's browser. The participants table passes fullname() output into role, group, and enrolment option labels without HTML-escaping quotes or other markup. An authenticated user must store a crafted participant name, and a victim must open an affected option, enabling script execution in that victim's session.

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

Stored XSS in Moodle LMS 4.3.3 and earlier allows remote authenticated users to execute script in another user's browser. The participants table passes fullname() output into role, group, and enrolment option labels without HTML-escaping quotes or other markup. An authenticated user must store a crafted participant name, and a victim must open an affected option, enabling script execution in that victim's session.

The record

CVE
CVE-2024-33998
Published
May 31, 2024
Updated
Mar 28, 2025
Vendor
Moodle
Product
Moodle LMS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 31, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 28, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.0 <=4.3.3
  2. Affected versionversion=4.1 <=4.1.9
  3. Affected versionversion=4.2 <=4.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Moodle · Moodle LMSversion=4.0 <=4.3.3; version=4.1 <=4.1.9; version=4.2 <=4.2.6

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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