What’s Vulnerable › Vulnerabilities

CVE-2024-33999: moodle: unsafe direct use of $_SERVER['HTTP_REFERER'] in admin/tool/mfa/index.php

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-31 · updated 2026-06-17
• Weakness: CWE-20

Description

The referrer URL used by MFA required additional sanitizing, rather than being used directly.

Affected products

• Moodle: from 4.3.0 before 4.3.4 — fixed in 4.3.4

How to fix

Upgrade to a fixed version: Moodle 4.3.4. Check the vendor advisory for mitigations.

References

• https://moodle.org/mod/forum/discuss.php?d=458387
• https://moodle.org/mod/forum/discuss.php?d=458387

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