5.4

CVSS Score

3.1

-

CVSS Score

Basic Information

CVE ID

CVE-2021-36568

GHSA ID

GHSA-fm6m-fg23-67jq

EPSS Score

0.38737%

CWE

CWE-79

Published

9/14/2022

Updated

1/30/2023

KEV Status

Technology

PHP

Basic Information

CVE ID

GHSA ID

EPSS Score

CWE

Published

Updated

KEV Status

Technology

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CVE-2021-36568

CVE-2021-36568: Moodle Cross-site Scripting vulnerability

In certain Moodle products after creating a course, it is possible to add in a arbitrary "Topic" a resource, in this case a "Database" with the type "Text" where its values "Field name" and "Field description" are vulnerable to Cross Site Scripting Stored(XSS). This affects Moodle 3.11.x prior to 3.11.10, Moodle 3.10.4, and Moodle 3.9.7.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2021-36568

CVE-2021-36568:

5.4

CVSS Score

3.1

-

CVSS Score

Basic Information

CVE ID

CVE-2021-36568

GHSA ID

GHSA-fm6m-fg23-67jq

EPSS Score

0.38737%

CWE

CWE-79

Published

9/14/2022

Updated

1/30/2023

KEV Status

Technology

PHP

Basic Information

CVE ID

GHSA ID

EPSS Score

CWE

Published

Updated

KEV Status

Technology

Technical Details

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
moodle/moodle	composer	<= 3.9.7
moodle/moodle	composer	>= 3.10.0, <= 3.10.4
moodle/moodle	composer	>= 3.11.0, < 3.11.10	3.11.10

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from improper input sanitization in Database activity text fields. Key points:

The attack vector requires storing XSS in field metadata ('Field name'/'description'), implicating the field persistence logic (update_field).
The XSS triggers in the search interface, indicating insecure output handling in display functions (display_search_field).
Moodle's architecture typically handles field storage in field.class.php and rendering in related methods. The pattern matches known XSS vulnerabilities where storage and display layers both lack sanitization.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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5.4

-

Basic Information

Basic Information

Concerned about an active attack path?

CVE-2021-36568: Moodle Cross-site Scripting vulnerability

CVE-2021-36568:

5.4

-

Basic Information

Basic Information

Technical Details

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

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Technical Details

Basic Information

Basic Information

CVE-2021-36568: Moodle Cross-site Scripting vulnerability

5.4

5.4

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

5.4

-

Basic Information

Basic Information

Concerned about an active attack path?

CVE-2021-36568: Moodle Cross-site Scripting vulnerability

CVE-2021-36568:

5.4

-

Basic Information

Basic Information

Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Vulnerability IntelligenceMiggo AI

Technical Details

Basic Information

Basic Information

CVE-2021-36568: Moodle Cross-site Scripting vulnerability

5.4

5.4

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI