What’s Vulnerable › Vulnerabilities

CVE-2021-20183

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-01-28 · updated 2026-06-17
• Weakness: CWE-79

Description

It was found in Moodle before version 3.10.1 that some search inputs were vulnerable to reflected XSS due to insufficient escaping of search queries.

Affected products

• Moodle: before 3.10.1 — fixed in 3.10.1

How to fix

Upgrade to a fixed version: Moodle 3.10.1. Check the vendor advisory for mitigations.

References

• https://moodle.org/mod/forum/discuss.php?d=417166
• https://moodle.org/mod/forum/discuss.php?d=417166

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