What’s Vulnerable › Vulnerabilities

CVE-2023-5546: Moodle: stored xss in quiz grading report via user id number

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-11-09 · updated 2026-06-17
• Weakness: CWE-79

Description

ID numbers displayed in the quiz grading report required additional sanitizing to prevent a stored XSS risk.

Affected products

• Fedoraproject Fedora: 37, 38, 39
• Moodle: from 4.0.0 before 4.0.11; from 4.1.0 before 4.1.6; from 4.2.0 before 4.2.3 — fixed in 4.0.11, 4.1.6, 4.2.3
• Red Hat Enterprise Linux: 7.0

How to fix

Upgrade to a fixed version: Moodle 4.0.11, 4.1.6, 4.2.3. Check the vendor advisory for mitigations.

References

• http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-78971
• https://bugzilla.redhat.com/show_bug.cgi?id=2243445
• https://moodle.org/mod/forum/discuss.php?d=451587
• http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-78971
• https://bugzilla.redhat.com/show_bug.cgi?id=2243445
• https://moodle.org/mod/forum/discuss.php?d=451587

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