What is CVE-2018-1137?

CVE-2018-1137 is a high-severity vulnerability in Moodle, classified under Improper Input Validation. CVSS score: 8.1/10. Published 2018-05-25.

How severe is CVE-2018-1137?

High severity. CVSS v3 base score is 8.1 out of 10.

Is CVE-2018-1137 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Moodle

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2018-05-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (75.6th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 75.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Moodle
Moodle 3.x Unknown — versions Moodle 3.x unknown

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

jev770/badmoodle-scan

References

www.securityfocus.com/bid/104307 (VDB Entry, Third Party Advisory, vdb-entry)
moodle.org/mod/forum/discuss.php (Vendor Advisory)

Frequently asked questions

What is CVE-2018-1137?: CVE-2018-1137 is a high-severity vulnerability in Moodle, classified under Improper Input Validation. CVSS score: 8.1/10. Published 2018-05-25.
How severe is CVE-2018-1137?: High severity. CVSS v3 base score is 8.1 out of 10.
Is CVE-2018-1137 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.