The version of Moodle installed on the remote host is 3.5.x prior to 3.5.16, 3.8.x prior to 3.8.7, 3.9.x prior to 3.9.4 or 3.10.x prior to 3.10.1. It is, therefore, affected by multiple vulnerabilities:

- A client-side Denial of Service (DoS) attack due to the lack of character limit when sending messages. (CVE-2021-20185)

- A stored Cross-Site Scripting vulnerability due to the lack of sanitization of TeX content when the TeX notation filter is enabled. (CVE-2021-20186)

- An arbitrary PHP code execution by site administrators via a PHP include used during Shibboleth authentication. (CVE-2021-20187)

- An information disclosure in grade related web services, allowing students to view other students grades. (CVE-2021-20184)

- A Cross-Site Scripting (XSS) vulnerability due to the lack of input sanitization on the search template inputs. (CVE-2021-20183)

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

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - It was found in Moodle before version 3.10.1, 3.9.4, 3.8.7 and 3.5.16 that messaging did not impose a
    character limit when sending messages, which could result in client-side (browser) denial of service for
    users receiving very large messages. (CVE-2021-20185)

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

  - It was found in Moodle before version 3.10.1, 3.9.4, 3.8.7 and 3.5.16 that messaging did not impose a     character limit when sending messages, which could result in client-side (browser) denial of service for     users receiving very large messages. (CVE-2021-20185)

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

ID	Name	Product	Family	Published	Updated	Severity
113630	Moodle 3.5.x < 3.5.16 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	2/20/2023	3/14/2023	high
113631	Moodle 3.8.x < 3.8.7 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	2/20/2023	3/14/2023	high
113633	Moodle 3.10.x < 3.10.1 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	2/20/2023	3/14/2023	high
113632	Moodle 3.9.x < 3.9.4 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	2/20/2023	3/14/2023	high
434405	SCA: security update for moodle/moodle (GHSA-c3j6-33r4-89q3)	Tenable Cloud Security	SCA Checks	8/19/2025	7/2/2026	medium
434405	SCA: security update for moodle/moodle (GHSA-c3j6-33r4-89q3)	Tenable Self-Hosted Container Security	SCA Checks	8/19/2025	7/2/2026	medium
262635	Linux Distros Unpatched Vulnerability : CVE-2021-20185	Nessus	Misc.	9/10/2025	7/10/2026	medium

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