CVE-2020-14321
HIGHCVE-2020-14321 is a high-severity (CVSS 8.8) CWE-863 vulnerability in moodle/moodle. 5 public exploit references exist, so weaponization risk is real. O3 Security confirms whether CVE-2020-14321 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Moodle Incorrect Authorization vulnerability
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
In Moodle before 3.9.1, 3.8.4, 3.7.7 and 3.5.13, teachers of a course were able to assign themselves the manager role within that course.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | moodle/moodle | ≥ 3.9.0-beta&&< 3.9.1 | 3.9.1 |
| 🐘Packagist | moodle/moodle | ≥ 3.8.0-beta&&< 3.8.4 | 3.8.4 |
| 🐘Packagist | moodle/moodle | ≥ 3.6.0-beta&&< 3.7.7 | 3.7.7 |
| 🐘Packagist | moodle/moodle | all versions | 3.5.13 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for moodle/moodle. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update moodle/moodle to 3.9.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-14321 is resolved across your whole dependency graph.
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.
How O3 protects you
O3 pinpoints whether CVE-2020-14321 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2020-14321. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2020-14321 in your dependencies?
O3 detects CVE-2020-14321 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.