moodle: unsafe direct use of $_SERVER['HTTP_REFERER'] in admin/tool/mfa/index.php
Priority HIGH 82CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub.
Summary
The referrer URL used by MFA required additional sanitizing, rather than being used directly.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00545 45th percentileScored 2026-11-07
Fix Fixed moodle/moodle (Packagist): 4.3.4
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Moodle | 4.3 – 4.3.3 | — | No fix listed | CNA |
| — | moodle/moodle (Packagist) | 4.3.0 to before 4.3.4 | 4.3.4 | Patch available | GHSA-r2wx-46gp-rp3h |
- Moodle Vendor— Affected 4.3 – 4.3.3 Fixed in — No fix listed CNA
- moodle/moodle (Packagist) Vendor— Affected 4.3.0 to before 4.3.4 Fixed in 4.3.4 Patch available GHSA-r2wx-46gp-rp3h
Remediation
- Fix · GHSA-r2wx-46gp-rp3h moodle/moodle (Packagist) Fixed in 4.3.4 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2024-33999
- 2026-10-03 Alias added: GHSA-r2wx-46gp-rp3h
References
More Moodle vulnerabilities
- TI-2021-14741 In Moodle, an SQL injection risk was identified in the library fetching a user's recent courses. CVSS 3.1CRITICAL 9.8
- TI-2024-29071 Moodle: remote code execution via calculated question types CVSS 3.1HIGH 8.1
- TI-2016-06653 Moodle 3.1.2 allows remote attackers to obtain sensitive information via unspecified… CVSS 3.1HIGH 7.5
- TI-2022-00259 SQL injection in moodle CVSS 3.1CRITICAL 9.8
- TI-2022-16116 Path traversal in Moodle CVSS 3.1HIGH 7.5
- TI-2018-01050 Code injection in Moodle 3.x unknown CVSS 3.0HIGH 8.8
Sources
- CVE-2024-33999 · CVE Program
- CVE-2024-33999 · NVD
- FIRST EPSS
- GHSA-r2wx-46gp-rp3h · GitHub Advisory Database · CC BY 4.0
- CVE-2024-33999 · Red Hat security data · CC BY 4.0
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