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HIGH severity

Moodle Arbitrary PHP code execution by site admins via Shibboleth configurationGHSA-2jrm-gww7-wch2

HIGH

GHSA-2jrm-gww7-wch2 is a high-severity (CVSS 7.2) Code Injection vulnerability in moodle/moodle. A fix is available for moodle/moodle — see the affected versions and patch details below.

Also known asBIT-moodle-2021-20187CVE-2021-20187
Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
None indexed
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs76th percentile — riskier than 76% of all scored CVEsHighest risk
0.18%0.82%1.45%2.09%0.7%1.6%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

It was found in Moodle before version 3.10.1, 3.9.4, 3.8.7 and 3.5.16 that it was possible for site administrators to execute arbitrary PHP scripts via a PHP include used during Shibboleth authentication.

Affected Packages

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistmoodle/moodle≥ 3.5&&< 3.5.163.5.16composer require moodle/moodle:^3.5.16
🐘Packagistmoodle/moodle≥ 3.8&&< 3.8.73.8.7composer require moodle/moodle:^3.8.7
🐘Packagistmoodle/moodle≥ 3.9&&< 3.9.43.9.4composer require moodle/moodle:^3.9.4
🐘Packagistmoodle/moodle≥ 3.10&&< 3.10.13.10.1composer require moodle/moodle:^3.10.1

Affected Products

1 product · 4 configurations
Application
moodlemoodle
≥ 3.9.0 && < 3.9.4
1 version
3.10.0

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 3.5.16 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-2jrm-gww7-wch2 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

It was found in Moodle before version 3.10.1, 3.9.4, 3.8.7 and 3.5.16 that it was possible for site administrators to execute arbitrary PHP scripts via a PHP include used during Shibboleth authentication.
O3 Security · Impact-Aware SCA

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