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Not in CISA KEV
HIGH severity

CVE-2018-1137 — moodle

HIGH

CVE-2018-1137 is a high-severity (CVSS 8.1) Improper Input Validation vulnerability in moodle/moodle. A fix is available for moodle/moodle — see the affected versions and patch details below.

Moodle Portfolio script allows instantiation of class chosen by user

Also known asGHSA-vxqh-mx28-7ghw
Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
None indexed
Exploitation data as of Oct 29, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.7%probability of exploitation in next 30 days
Lower Risk+0.09%
Lower risk than most CVEs78th percentile — riskier than 78% of all scored CVEsHighest risk
0.00%0.75%1.49%2.24%0.2%1.7%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

4 pkgs affected
🐘moodle/moodle🐘moodle/moodle🐘moodle/moodle🐘moodle/moodle

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistmoodle/moodle≥ 3.1&&< 3.1.123.1.12composer require moodle/moodle:^3.1.12
🐘Packagistmoodle/moodle≥ 3.2&&< 3.2.93.2.9composer require moodle/moodle:^3.2.9
🐘Packagistmoodle/moodle≥ 3.3&&< 3.3.63.3.6composer require moodle/moodle:^3.3.6
🐘Packagistmoodle/moodle≥ 3.4&&< 3.4.33.4.3composer require moodle/moodle:^3.4.3

Affected Products

1 product · 4 configurations
Application
moodlemoodle
≥ 3.4.0 && ≤ 3.4.2
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for moodle/moodle, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update moodle/moodle to 3.1.12 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-1137 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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CVE-2018-1137: moodle — Fixed in 3.1.12