Moodle: ssrf risk due to insufficient check on the curl blocked hosts
Priority MEDIUM 42CWE-918Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-918 and the CVSS impact.
Summary
An issue in the logic used to check 0.0.0.0 against the cURL blocked hosts lists resulted in an SSRF risk. This flaw affects Moodle versions 4.2, 4.1 to 4.1.3, 4.0 to 4.0.8, 3.11 to 3.11.14, 3.9 to 3.9.21 and earlier unsupported versions.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00825 57th percentileScored 2026-11-07
Fix Fixed moodle: 4.2.1, 4.1.4, 4.0.9 +2moodle/moodle (Packagist): 4.2.1, 4.1.4, 4.0.9 +2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- 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 | 4.2.0 to before 4.2.1; 4.1.0 to before 4.1.4; 4.0.0 to before 4.0.9; 3.11.0 to before 3.11.15; before 3.9.22 | 4.2.1, 4.1.4, 4.0.9, 3.11.15, 3.9.22 | Patch available | CNA |
| — | moodle/moodle (Packagist) | 4.2.0 to before 4.2.1 | 4.2.1 | Patch available | GHSA-xxp4-mf4h-6cwm |
| — | moodle/moodle (Packagist) | 4.1.0 to before 4.1.4 | 4.1.4 | Patch available | GHSA-xxp4-mf4h-6cwm |
| — | moodle/moodle (Packagist) | 4.0.0 to before 4.0.9 | 4.0.9 | Patch available | GHSA-xxp4-mf4h-6cwm |
| — | moodle/moodle (Packagist) | 3.10.0 to before 3.11.15 | 3.11.15 | Patch available | GHSA-xxp4-mf4h-6cwm |
| — | moodle/moodle (Packagist) | before 3.9.22 | 3.9.22 | Patch available | GHSA-xxp4-mf4h-6cwm |
- moodle Vendor— Affected 4.2.0 to before 4.2.1; 4.1.0 to before 4.1.4; 4.0.0 to before 4.0.9; 3.11.0 to before 3.11.15; before 3.9.22 Fixed in 4.2.1, 4.1.4, 4.0.9, 3.11.15, 3.9.22 Patch available CNA
- moodle/moodle (Packagist) Vendor— Affected 4.2.0 to before 4.2.1 Fixed in 4.2.1 Patch available GHSA-xxp4-mf4h-6cwm
- moodle/moodle (Packagist) Vendor— Affected 4.1.0 to before 4.1.4 Fixed in 4.1.4 Patch available GHSA-xxp4-mf4h-6cwm
- moodle/moodle (Packagist) Vendor— Affected 4.0.0 to before 4.0.9 Fixed in 4.0.9 Patch available GHSA-xxp4-mf4h-6cwm
- moodle/moodle (Packagist) Vendor— Affected 3.10.0 to before 3.11.15 Fixed in 3.11.15 Patch available GHSA-xxp4-mf4h-6cwm
- moodle/moodle (Packagist) Vendor— Affected before 3.9.22 Fixed in 3.9.22 Patch available GHSA-xxp4-mf4h-6cwm
Remediation
- Fix · CNA moodle Fixed in 4.2.1, 4.1.4, 4.0.9, 3.11.15, 3.9.22
- Fix · GHSA-xxp4-mf4h-6cwm moodle/moodle (Packagist) Fixed in 4.2.1 Advisory →
- Fix · GHSA-xxp4-mf4h-6cwm moodle/moodle (Packagist) Fixed in 4.1.4 Advisory →
- Fix · GHSA-xxp4-mf4h-6cwm moodle/moodle (Packagist) Fixed in 4.0.9 Advisory →
- Fix · GHSA-xxp4-mf4h-6cwm moodle/moodle (Packagist) Fixed in 3.11.15 Advisory →
- Fix · GHSA-xxp4-mf4h-6cwm moodle/moodle (Packagist) Fixed in 3.9.22 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2023-35133
- 2026-10-03 Alias added: GHSA-xxp4-mf4h-6cwm
References
Advisory 3
Other 7
- RHBZ#2214373
- https://github.com/moodle/moodle
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7A72KX4WU6GK2CX4TKYFGFASPKOEOJFC
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I5QAEAGJ44NVXLAJFJXKARKC45OGEDXT
- https://lists.fedoraproject.org/archives/list/[email protected]/message/7A72KX4WU6GK2CX4TKYFGFASPKOEOJFC
- https://lists.fedoraproject.org/archives/list/[email protected]/message/I5QAEAGJ44NVXLAJFJXKARKC45OGEDXT
- http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-78215
More Moodle vulnerabilities
- TI-2024-22468 moodle: unsafe direct use of $_SERVER['HTTP_REFERER'] in admin/tool/mfa/index.php CVSS 3.1CRITICAL 9.8
- 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
Sources
- CVE-2023-35133 · CVE Program
- CVE-2023-35133 · NVD
- FIRST EPSS
- GHSA-xxp4-mf4h-6cwm · GitHub Advisory Database · CC BY 4.0
- CVE-2023-35133 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences