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Vulnerability DatabaseCVE-2023-23921
CVE-2023-23921:
PHP vulnerability analysis and mitigation
Overview
A reflected Cross-Site Scripting (XSS) vulnerability was discovered in Moodle, identified as CVE-2023-23921. The vulnerability exists due to insufficient sanitization of user-supplied data in some returnurl parameters. The issue affects Moodle versions 4.1, 4.0 to 4.0.5, 3.11 to 3.11.11, 3.9 to 3.9.18, and earlier unsupported versions. The vulnerability was fixed in versions 4.1.1, 4.0.6, 3.11.12, and 3.9.19 (Moodle Security).
Technical details
The vulnerability is classified as CWE-79 (Cross-site Scripting) and requires additional sanitizing of returnurl parameters to prevent reflected XSS attacks. The issue was discovered by DegrangeM and was assigned a 'Serious' severity rating (NVD CWE).
Impact
This flaw allows remote attackers to perform cross-site scripting (XSS) attacks against Moodle installations (CISA Bulletin).
Mitigation and workarounds
The recommended mitigation is to upgrade to the fixed versions: Moodle 4.1.1, 4.0.6, 3.11.12, or 3.9.19. These versions include proper sanitization of the returnurl parameters (Moodle Security).
Additional resources
Source: This report was generated using AI
Related PHP vulnerabilities:
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