CVE-2023-23921: Moodle Cross-site Scripting vulnerability

medium Affects moodle/moodle. Feed 2026.10.29.1, updated 2026-10-28; published 2023-02-17; advisory modified 2023-12-06.

Moodle Cross-site Scripting vulnerability

Package: moodle/moodle Composer
Affected versions: <3.9.19 or >=3.10.0 and <3.11.12 or >=4.0.0-beta and <4.0.6 or >=4.1.0-beta and <4.1.1
Fixed in: 3.9.19, 3.11.12, 4.0.6, 4.1.1
Severity: medium CVSS 6.1
Exploitation: not on CISA KEV · EPSS 1% (56.9th percentile)
Published: 2023-02-17
Source: osv.dev

References

CWE-79

NVD record moodle/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.

# one-time install
pip install phpwarden

# then
phpwarden deps composer.lock

Or keep it checked automatically: GitHub Action · pre-commit hook · GitLab CI · Laravel artisan command

Install docs How findings are ranked

Related advisories

CVE-2024-43425 high Moodle Remote Code Execution vulnerability same package: moodle/moodle
CVE-2022-35650 high Moodle Arbitrary file read when importing lesson questions same package: moodle/moodle
CVE-2021-36393 critical Moodle SQL Injection vulnerability same package: moodle/moodle
CVE-2022-0332 critical SQL injection in Moodle same package: moodle/moodle
CVE-2013-3630 medium Moodle Authenticated Spelling Binary Remote Code Execution same package: moodle/moodle
CVE-2018-1133 high Moodle calculated question type allows remote code execution by Question authors same package: moodle/moodle