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HIGH severity

Moodle calculated question type allows remote code execution by Question authorsGHSA-xh2j-q4mc-v522

HIGH

GHSA-xh2j-q4mc-v522 is a high-severity (CVSS 8.8) Code Injection vulnerability in moodle/moodle. 4 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for moodle/moodle — see the affected versions and patch details below.

Also known asCVE-2018-1133
Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
4 known
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
30.8%probability of exploitation in next 30 days
Moderate Risk-0.51%
Lower risk than most CVEs98th percentile — riskier than 98% of all scored CVEsHighest risk
20.7%38.7%56.6%74.6%64.5%30.8%May 26Sep 26Nov 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. A Teacher creating a Calculated question can intentionally cause remote code execution on the server, aka eval injection.

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
Exploits & PoCs
4

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-46551webappsphp

Moodle 3.4.1 - Remote Code Execution

by Darryn Ten · Mar 15, 2019

Exploit-DB Source

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 GHSA-xh2j-q4mc-v522 is resolved across your whole dependency graph.

  3. Workarounds

    Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Frequently Asked Questions

An issue was discovered in Moodle 3.x. A Teacher creating a Calculated question can intentionally cause remote code execution on the server, aka eval injection.
O3 Security · Impact-Aware SCA

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Moodle calculated question type allows remote code…