CVE-2019-14827Network attack vector

Cross-site scripting via unescaped recursive Mustache helpers

Published May 17, 2021 · Updated Aug 5, 2024

Cross-site scripting in Moodle LMS 3.7 through 3.7.1, 3.6 through 3.6.5, and 3.5 through 3.5.7 allows remote attackers to inject JavaScript. Mustache helper tags carried in template contexts are rendered recursively into another helper without escaping the nested context. A victim must view an affected rendered template; execution occurs in that user’s browser and can read or alter data available to the session.

CVSS severity6.1
Medium
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Moodle LMS 3.7 through 3.7.1, 3.6 through 3.6.5, and 3.5 through 3.5.7 allows remote attackers to inject JavaScript. Mustache helper tags carried in template contexts are rendered recursively into another helper without escaping the nested context. A victim must view an affected rendered template; execution occurs in that user’s browser and can read or alter data available to the session.

The record

CVE
CVE-2019-14827
Published
May 17, 2021
Updated
Aug 5, 2024
Vendor
Moodle
Product
Moodle LMS
Classifications
CWE-94, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=3.7 to 3.7.1, 3.6 to 3.6.5, 3.5 to 3.5.7 and earlier unsupported versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Moodle · Moodle LMSversion=3.7 to 3.7.1, 3.6 to 3.6.5, 3.5 to 3.5.7 and earlier unsupported versions

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/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-94Improper Control of Generation of Code ('Code Injection')
T1059.007Command and Scripting Interpreter: JavaScript/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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