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MEDIUM severity

Moodle Cross-site Scripting vulnerabilityGHSA-97qf-pq7x-964m

MEDIUM

GHSA-97qf-pq7x-964m is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in moodle/moodle. A fix is available for moodle/moodle — see the affected versions and patch details below.

Also known asBIT-moodle-2023-23921CVE-2023-23921
Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
None indexed
Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs57th percentile — riskier than 57% of all scored CVEsHighest risk
0.00%0.44%0.88%1.31%0.3%0.8%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

The vulnerability was found Moodle which exists due to insufficient sanitization of user-supplied data in some returnurl parameters. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website. This flaw allows a remote attacker to perform cross-site scripting (XSS) attacks.

Affected Packages

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistmoodle/moodleall versions3.9.19composer require moodle/moodle:^3.9.19
🐘Packagistmoodle/moodle≥ 3.10.0&&< 3.11.123.11.12composer require moodle/moodle:^3.11.12
🐘Packagistmoodle/moodle≥ 4.0.0-beta&&< 4.0.64.0.6composer require moodle/moodle:^4.0.6
🐘Packagistmoodle/moodle≥ 4.1.0-beta&&< 4.1.14.1.1composer require moodle/moodle:^4.1.1

Affected Products

1 product · 4 configurations
Application
moodlemoodle
≥ 4.0.0 && < 4.0.6
1 version
4.1.0

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 3.9.19 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-97qf-pq7x-964m 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 vulnerability was found Moodle which exists due to insufficient sanitization of user-supplied data in some returnurl parameters. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website. This flaw allows a remote attacker to perform cross-site scripting (XSS) attacks.
O3 Security · Impact-Aware SCA

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Moodle Cross-site Scripting vulnerability (Medium 6.1)