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Moodle Cross-site Scripting vulnerability

Moderate severity GitHub Reviewed Published Sep 14, 2022 to the GitHub Advisory Database • Updated Jan 30, 2023

Package

composer moodle/moodle (Composer)

Affected versions

<= 3.9.7
>= 3.10.0, <= 3.10.4
>= 3.11.0, < 3.11.10

Patched versions

3.11.10

Description

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.

References

Published by the National Vulnerability Database Sep 13, 2022
Published to the GitHub Advisory Database Sep 14, 2022
Reviewed Sep 21, 2022
Last updated Jan 30, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.088%
(39th percentile)

Weaknesses

CVE ID

CVE-2021-36568

GHSA ID

GHSA-fm6m-fg23-67jq

Source code

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