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CVE-2024-33999

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

9.8 CriticalFix available

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

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.55%Up 0.5 points since Jun 1, 2024
90%50%10%1%

What each source reports

CVE List Score used 9.8

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

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

Record
CVE-2024-33999
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-20
Updated
2026-11-02
EUVDEUVD-2024-1760 9.8

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

Record
EUVD-2024-1760
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-03
GitHub AdvisoriesGHSA-r2wx-46gp-rp3h No score

Moodle Improper Input Validation

Unsafe direct use of $_SERVER['HTTP_REFERER'] in admin/tool/mfa/index.php. The referrer URL used by MFA required additional sanitizing, rather than being used directly.

Record
GHSA-r2wx-46gp-rp3h
Weakness
CWE-20
Updated
2026-11-02
NVD 9.8

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

Record
CVE-2024-33999
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-20
Updated
2026-11-02
OSV 9.8

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

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

Record
CVE-2024-33999
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-20
Updated
2026-11-02
OSVUBUNTU-CVE-2024-33999 9.8

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

Record
UBUNTU-CVE-2024-33999
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVBIT-moodle-2024-33999 No score

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

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

Record
BIT-moodle-2024-33999
Updated
2026-11-02
OSVGHSA-r2wx-46gp-rp3h No score

Moodle Improper Input Validation

Unsafe direct use of $_SERVER['HTTP_REFERER'] in admin/tool/mfa/index.php. The referrer URL used by MFA required additional sanitizing, rather than being used directly.

Record
GHSA-r2wx-46gp-rp3h
Weakness
CWE-20
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
moodle/moodle
Packagist
 4.3.0 up to 4.3.4
4.3.4
moodle
Bitnami
 4.3.0 up to 4.3.4
4.3.4
moodle/moodle
Packagist
 4.3.0 up to 4.3.4, plus listed versions
v4.3.0v4.3.1v4.3.2v4.3.3
4.3.4
moodle
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
2.7.9+dfsg-12.7.10+dfsg-12.7.11+dfsg-12.7.11+dfsg-22.7.12+dfsg-13.0.3+dfsg-0ubuntu13.0.3+dfsg-0ubuntu1+esm1
 None known
moodle
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
3.0.3+dfsg-0ubuntu13.0.3+dfsg-0ubuntu1+esm1
 None known

History

History
RecordedChangedSources
aliases, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-33999 is a critical vulnerability (CVSS 9.8) in Moodle, published May 31, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.55%, the 45th percentile. Fixed in moodle/moodle 4.3.4.

References

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