CVE-2018-1137
Moodle Portfolio script allows instantiation of class chosen by user
An issue was discovered in Moodle 3.x. By substituting URLs in portfolios, users can instantiate any class. This can also be exploited by users who are logged in as guests to create a DDoS attack.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in Moodle 3.x. By substituting URLs in portfolios, users can instantiate any class. This can also be exploited by users who are logged in as guests to create a DDoS attack.
- Record
CVE-2018-1137- CVSS 3.0
- 8.1 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H - CVSS 2.0
- 5.5 Medium
AV:N/AC:L/Au:S/C:N/I:P/A:P - Weakness
- CWE-20
- Updated
- 2026-11-02
CVE List No score
An issue was discovered in Moodle 3.x. By substituting URLs in portfolios, users can instantiate any class. This can also be exploited by users who are logged in as guests to create a DDoS attack.
- Record
CVE-2018-1137- Updated
- 2026-11-02
EUVDEUVD-2022-5458 No score
An issue was discovered in Moodle 3.x. By substituting URLs in portfolios, users can instantiate any class. This can also be exploited by users who are logged in as guests to create a DDoS attack.
- Record
EUVD-2022-5458- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vxqh-mx28-7ghw
Moodle Portfolio script allows instantiation of class chosen by user
An issue was discovered in Moodle 3.x. By substituting URLs in portfolios, users can instantiate any class. This can also be exploited by users who are logged in as guests to create a DDoS attack.
- Record
GHSA-vxqh-mx28-7ghw- CVSS 3.0
- 8.1 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H - Weakness
- CWE-20
- Updated
- 2026-11-02
OSV
An issue was discovered in Moodle 3.x. By substituting URLs in portfolios, users can instantiate any class. This can also be exploited by users who are logged in as guests to create a DDoS attack.
- Record
CVE-2018-1137- CVSS 3.0
- 8.1 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-vxqh-mx28-7ghw
Moodle Portfolio script allows instantiation of class chosen by user
An issue was discovered in Moodle 3.x. By substituting URLs in portfolios, users can instantiate any class. This can also be exploited by users who are logged in as guests to create a DDoS attack.
- Record
GHSA-vxqh-mx28-7ghw- CVSS 3.0
- 8.1 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H - Weakness
- CWE-20
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2018-1137
An issue was discovered in Moodle 3.x. By substituting URLs in portfolios, users can instantiate any class. This can also be exploited by users who are logged in as guests to create a DDoS attack.
- Record
UBUNTU-CVE-2018-1137- CVSS 3.0
- 8.1 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
moodle/moodlePackagist |
3.1 up to 3.1.12 | 3.1.12 |
moodle/moodlePackagist |
3.2 up to 3.2.9 | 3.2.9 |
moodle/moodlePackagist |
3.3 up to 3.3.6 | 3.3.6 |
moodle/moodlePackagist |
3.4 up to 3.4.3 | 3.4.3 |
moodle/moodlePackagist |
3.1 up to 3.1.12, plus listed versions v3.1.0v3.1.0-betav3.1.0-rc1v3.1.0-rc2v3.1.1 Show 10 moreShow lessv3.1.10v3.1.11v3.1.2v3.1.3v3.1.4v3.1.5v3.1.6v3.1.7v3.1.8v3.1.9 |
3.1.12 |
moodle/moodlePackagist |
3.2 up to 3.2.9, plus listed versions v3.2.0v3.2.0-betav3.2.0-rc1v3.2.0-rc2v3.2.0-rc3 Show 10 moreShow lessv3.2.0-rc4v3.2.0-rc5v3.2.1v3.2.2v3.2.3v3.2.4v3.2.5v3.2.6v3.2.7v3.2.8 |
3.2.9 |
moodle/moodlePackagist |
3.3 up to 3.3.6, plus listed versions v3.3.0v3.3.0-betav3.3.0-rc1v3.3.0-rc2v3.3.0-rc3 Show 5 moreShow lessv3.3.1v3.3.2v3.3.3v3.3.4v3.3.5 |
3.3.6 |
moodle/moodlePackagist |
3.4 up to 3.4.3, plus listed versions v3.4.0v3.4.0-betav3.4.0-rc1v3.4.0-rc2v3.4.0-rc3v3.4.1v3.4.2 |
3.4.3 |
moodleUbuntu: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 |
moodleUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 3.0.3+dfsg-0ubuntu13.0.3+dfsg-0ubuntu1+esm1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2018-1137 is a high vulnerability (CVSS 8.1) in Moodle, published May 25, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.71%, the 77th percentile. Fixed in moodle/moodle 3.1.12.