CVE-2024-43437: Moodle: xss risk when restoring malicious course backup file

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-11 · updated 2026-06-17
Weakness: CWE-79

Description

A flaw was found in moodle. Insufficient sanitizing of data when performing a restore could result in a cross-site scripting (XSS) risk from malicious backup files.

Affected products

Moodle: before 4.1.12; from 4.2.0 before 4.2.9; from 4.3.0 before 4.3.6; from 4.4.0 before 4.4.2 — fixed in 4.1.12, 4.2.9, 4.3.6, 4.4.2

How to fix

Upgrade to a fixed version: Moodle 4.1.12, 4.2.9, 4.3.6, 4.4.2. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=2304266
https://moodle.org/mod/forum/discuss.php?d=461207

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