CVE-2024-33997Network attack vector

Stored XSS via unescaped equation tag wrappers

Published May 31, 2024 · Updated Nov 21, 2024

Stored XSS in Moodle LMS before 4.1.10, 4.2.0 through 4.2.6, and 4.3.0 through 4.3.3 allows remote attackers to execute script. The MathJax loader filter() method passed angle brackets inside curly-brace equation wrappers through without converting them to HTML entities. Execution requires a user to open the equation editor for another user's crafted equation, limiting the consequence to script running in that user's browser context.

CVSS severity6.1
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 before 4.1.10, 4.2.0 through 4.2.6, and 4.3.0 through 4.3.3 allows remote attackers to execute script. The MathJax loader filter() method passed angle brackets inside curly-brace equation wrappers through without converting them to HTML entities. Execution requires a user to open the equation editor for another user's crafted equation, limiting the consequence to script running in that user's browser context.

The record

CVE
CVE-2024-33997
Published
May 31, 2024
Updated
Nov 21, 2024
Vendor
Moodle
Product
Moodle LMS
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 31, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 21, 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=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 privilegesunauthenticated

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

6.1CISA-ADPCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1203Exploitation for Client Execution

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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