The vulnerability was found Moodle which exists due to insufficient sanitization of user-supplied data in some returnurl parameters. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website. This flaw allows a remote attacker to perform cross-site scripting (XSS) attacks.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - The vulnerability was found Moodle which exists due to insufficient sanitization of user-supplied data in     some returnurl parameters. A remote attacker can trick the victim to follow a specially crafted link and     execute arbitrary HTML and script code in user's browser in context of vulnerable website. This flaw     allows a remote attacker to perform cross-site scripting (XSS) attacks. (CVE-2023-23921)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of Moodle installed on the remote host is 3.9.x prior to 3.9.19, 3.11.x prior to 3.11.12, 4.0.x prior to 4.0.6 or 4.1.x prior to 4.1.1. It is, therefore, affected by multiple vulnerabilities:

 - A Cross-Site Scripting (XSS) vulnerability due to the lack of sanitization of some returnurl parameters. (CVE-2023-23921)

 - A Cross-Site Scripting (XSS) vulnerability due to the lack of sanitization in the blog search functionnality. (CVE-2023-23922)

 - An Insecure Direct Object Reference (IDOR) vulnerability allowing users to set the preferred start page of any other user. (CVE-2023-23923)

Note that the scanner has not attempted to exploit this issue but has instead relied only on application's self-reported version number.

ID	Name	Product	Family	Severity
260599	Linux Distros Unpatched Vulnerability : CVE-2023-23921	Nessus	Misc.	medium
113588	Moodle 4.1.x < 4.1.1 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	high
113587	Moodle 4.0.x < 4.0.6 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	high
113586	Moodle 3.11.x < 3.11.12 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	high
113585	Moodle 3.9.x < 3.9.19 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	high

Detections

Analytics

CVE-2023-23921

medium

Tenable Plugins

medium

high

high

high

high