Cross-site scripting (XSS) and Server side request forgery (SSRF) in moodle

MEDIUM 5.4CVE-2021-20280 · BIT-moodle-2021-20280 · GHSA-x2jp-hh65-4xvf · Published 15/03/2021 · updated 17/06/2026

In short

CVE-2021-20280 is a MEDIUM (CVSS 5.4) vulnerability affecting moodle/moodle, moodle (moodle).
Chance of exploitation in the next 30 days (EPSS): 1.3%, higher than 69.9% of all vulnerabilities.
Fix: update to 3.10.2, 3.5.17, 3.8.8, 3.9.5 or later.

Package	Affected versions	Patched versions
moodle/moodle Packagist	`≥ 3.10, < 3.10.2≥ 3.5, < 3.5.17≥ 3.8, < 3.8.8≥ 3.9, < 3.9.5`	`3.10.23.5.173.8.83.9.5`
moodle moodle	`≥ 3.10.0, < 3.10.2≥ 3.5.0, < 3.5.17≥ 3.8.0, < 3.8.8≥ 3.9.0, < 3.9.5`	`3.10.23.5.173.8.83.9.5`

Text-based feedback answers required additional sanitizing to prevent stored XSS and blind SSRF risks in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.

NVD description

Text-based feedback answers required additional sanitizing to prevent stored XSS and blind SSRF risks in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.

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Package

Affected versions

Patched versions

Packagist

≥ 3.10, < 3.10.2≥ 3.5, < 3.5.17≥ 3.8, < 3.8.8≥ 3.9, < 3.9.5

3.10.23.5.173.8.83.9.5

≥ 3.10.0, < 3.10.2≥ 3.5.0, < 3.5.17≥ 3.8.0, < 3.8.8≥ 3.9.0, < 3.9.5

3.10.23.5.173.8.83.9.5

Description

Text-based feedback answers required additional sanitizing to prevent stored XSS and blind SSRF risks in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.

NVD description

Text-based feedback answers required additional sanitizing to prevent stored XSS and blind SSRF risks in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.

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