Moodle Information Disclosure vulnerabilityGHSA-wx87-h539-4775
MEDIUMGHSA-wx87-h539-4775 is a medium-severity (CVSS 5.3) Information Exposure vulnerability in moodle/moodle. A fix is available for moodle/moodle — see the affected versions and patch details below.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
GHSA-wx87-h539-4775 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
moodle/moodle🐘moodle/moodle🐘moodle/moodle🐘moodle/moodleReal-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 possible for a student to view their quiz grade before it had been released, using a quiz web service. Moodle 3.10 to 3.10.3, 3.9 to 3.9.6, 3.8 to 3.8.8, 3.5 to 3.5.17 and earlier unsupported versions are affected
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | moodle/moodle | ≥ 3.5&&< 3.5.18 | 3.5.18composer require moodle/moodle:^3.5.18 |
| 🐘Packagist | moodle/moodle | ≥ 3.8&&< 3.8.9 | 3.8.9composer require moodle/moodle:^3.8.9 |
| 🐘Packagist | moodle/moodle | ≥ 3.9&&< 3.9.7 | 3.9.7composer require moodle/moodle:^3.9.7 |
| 🐘Packagist | moodle/moodle | ≥ 3.10&&< 3.10.4 | 3.10.4composer require moodle/moodle:^3.10.4 |
Affected Products
moodlemoodleDetection & mitigation playbook
Open-source dependencyDetect
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.
Fix
Update moodle/moodle to 3.5.18 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-wx87-h539-4775 is resolved across your whole dependency graph.
Workarounds
Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.
Frequently Asked Questions
Is GHSA-wx87-h539-4775 in your dependencies?
Find it across Packagist, including transitive dependencies.