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MEDIUM severity

Moodle Vulnerable to Reflected Cross-site ScriptingGHSA-xhfx-rm8q-c3xv

MEDIUMFix: moodle/moodle@dc9de7b

GHSA-xhfx-rm8q-c3xv is a medium-severity (CVSS 5.4) 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-2021-20183CVE-2021-20183
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk+0.01%
Lower risk than most CVEs58th percentile — riskier than 58% of all scored CVEsHighest risk
0.00%0.44%0.88%1.33%0.5%0.8%0.8%0.8%Jun 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

It was found in Moodle before version 4.0.0-beta that some search inputs were vulnerable to reflected Cross-site Scripting (XSS) due to insufficient escaping of search queries.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistmoodle/moodle≥ 3.10&&< 4.0.0-beta4.0.0-betacomposer require moodle/moodle:^4.0.0-beta

Affected Products

1 product · 1 configurations
Application
moodlemoodle
< 3.10.1
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 4.0.0-beta or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xhfx-rm8q-c3xv 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

It was found in Moodle before version 4.0.0-beta that some search inputs were vulnerable to reflected Cross-site Scripting (XSS) due to insufficient escaping of search queries.
O3 Security · Impact-Aware SCA

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Moodle Vulnerable to Reflected Cross-site Scripting