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Cross-site scripting (XSS) and Server side request forgery (SSRF) in moodle

Moderate severity GitHub Reviewed Published Mar 29, 2021 to the GitHub Advisory Database • Updated Sep 13, 2023

Package

composer moodle/moodle (Composer)

Affected versions

>= 3.10, < 3.10.2
>= 3.9, < 3.9.5
>= 3.8, < 3.8.8
>= 3.5, < 3.5.17

Patched versions

3.10.2
3.9.5
3.8.8
3.5.17

Description

Text-based feedback answers required additional sanitizing to prevent stored XSS and blind SSRF risks in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.

References

Published by the National Vulnerability Database Mar 15, 2021
Reviewed Mar 24, 2021
Published to the GitHub Advisory Database Mar 29, 2021
Last updated Sep 13, 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

0.161%
(53rd percentile)

Weaknesses

CVE ID

CVE-2021-20280

GHSA ID

GHSA-x2jp-hh65-4xvf

Source code

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