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HIGH severity

CVE-2020-25698 — moodle

HIGHFix: moodle/moodle@c8ac07f

CVE-2020-25698 is a high-severity (CVSS 7.5) CWE-284 vulnerability in moodle/moodle. A fix is available for moodle/moodle — see the affected versions and patch details below.

Improper Access Control in moodle

Also known asBIT-moodle-2020-25698GHSA-vxhx-gmhm-623c
Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs79th percentile — riskier than 79% of all scored CVEsHighest risk
0.20%0.94%1.68%2.42%0.7%1.9%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2020-25698 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

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

Users' enrollment capabilities were not being sufficiently checked in Moodle when they are restored into an existing course. This could lead to them unenrolling users without having permission to do so. Versions affected: 3.5 to 3.5.14, 3.7 to 3.7.8, 3.8 to 3.8.5, 3.9 to 3.9.2 and earlier unsupported versions. Fixed in 3.9.3, 3.8.6, 3.7.9, 3.5.15, and 3.10.

Affected Packages

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistmoodle/moodle≥ 3.9.0&&< 3.9.33.9.3composer require moodle/moodle:^3.9.3
🐘Packagistmoodle/moodle≥ 3.8.0&&< 3.8.63.8.6composer require moodle/moodle:^3.8.6
🐘Packagistmoodle/moodle≥ 3.7.0&&< 3.7.93.7.9composer require moodle/moodle:^3.7.9
🐘Packagistmoodle/moodle≥ 3.5&&< 3.5.153.5.15composer require moodle/moodle:^3.5.15

Affected Products

2 products · 6 configurations
OS
fedorafedoraproject
2 versions
3233
Application
moodlemoodle
≥ 3.9.0 && ≤ 3.9.2
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 3.9.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-25698 is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

Users' enrollment capabilities were not being sufficiently checked in Moodle when they are restored into an existing course. This could lead to them unenrolling users without having permission to do so. Versions affected: 3.5 to 3.5.14, 3.7 to 3.7.8, 3.8 to 3.8.5, 3.9 to 3.9.2 and earlier unsupported versions. Fixed in 3.9.3, 3.8.6, 3.7.9, 3.5.15, and 3.10.
O3 Security · Impact-Aware SCA

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CVE-2020-25698: moodle — Fixed in 3.9.3