Persistent Cross-Site Scripting in Moodle by Moodle HQ
CVE-2021-27131

5.4MEDIUM

Key Information:

Vendor

Moodle
Status
Moodle
Vendor
CVE Published:
16 May 2023

What is CVE-2021-27131?

Moodle version 3.10.1 is vulnerable to persistent cross-site scripting due to improper input sanitization in the 'Additional HTML Section' via the 'Header and Footer' parameter in the admin settings. This flaw allows an attacker to potentially execute a stored XSS payload, which could lead to the theft of authentication cookies for both admin and user accounts. Although the vendor argues that inputs can only be supplied by administrators who are expected to use sanitized inputs, the risk associated with allowing unsanitized JavaScript remains a significant concern.

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References

https://github.com/moodle/moodle
https://github.com/p4nk4jv/CVEs-Assigned/blob/master/Mood...
https://docs.moodle.org/402/en/Risks

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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