CVE-2021-20186: Moodle Cross-site Scripting

medium Affects moodle/moodle. Feed 2026.10.29.1, updated 2026-10-28; published ; advisory modified .

Moodle Cross-site Scripting

Package
moodle/moodle Composer
Affected versions
>=3.10 and <3.10.1 or >=3.9 and <3.9.4 or >=3.8 and <3.8.7 or >=3.5 and <3.5.16
Fixed in
3.10.1, 3.9.4, 3.8.7, 3.5.16
Severity
medium  CVSS 5.4
Exploitation
not on CISA KEV · EPSS 1% (55.3th percentile)
Published
2022-05-24
Source
osv.dev

References

CWE-79
NVD recordmoodle/moodle advisories

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
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