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MEDIUM severity

CVE-2020-25627 — moodle

MEDIUM

CVE-2020-25627 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in moodle/moodle. 2 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.

Moodle stored Cross-site Scripting (XSS)

Also known asBIT-moodle-2020-25627GHSA-mgfp-qcf2-pw3m
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
2 known
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
3.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs90th percentile — riskier than 90% of all scored CVEsHighest risk
3.19%4.08%4.97%5.85%5.4%3.7%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

1 pkg affected
🐘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

The moodlenetprofile user profile field required extra sanitizing to prevent a stored XSS risk. This affects versions 3.9 to 3.9.1. Fixed in 3.9.2.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistmoodle/moodle≥ 3.9&&< 3.9.23.9.2composer require moodle/moodle:^3.9.2

Affected Products

1 product · 1 configurations
Application
moodlemoodle
≥ 3.9.0 && < 3.9.2
range
Exploits & PoCs
2

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

The moodlenetprofile user profile field required extra sanitizing to pre…

github.comGithubJun 2021

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 3.9.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-25627 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

The moodlenetprofile user profile field required extra sanitizing to prevent a stored XSS risk. This affects versions 3.9 to 3.9.1. Fixed in 3.9.2.
O3 Security · Impact-Aware SCA

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CVE-2020-25627: moodle XSS — Fixed in 3.9.2