In Moodle before 3.9.1, 3.8.4, 3.7.7 and 3.5.13, yui_combo needed to limit the amount of files it can load to help mitigate the risk of denial of service.

Moodle does not revoke role capabilities correctly

Multiple PHP remote file inclusion vulnerabilities in Moodle 1.7.1 allow remote attackers to execute arbitrary PHP code via a URL in the cmd parameter to (1) admin/utfdbmigrate.php or (2) filter.php.

Moodle Improper Access Control

Moodle IDOR when accessing list of badge recipients

Moodle vulnerable to Stored Cross-site Scripting

Moodle 2.0.x before 2.0.5 and 2.1.x before 2.1.2 allows remote attackers to bypass intended access restrictions and perform global searches by leveraging the guest role and making a direct request to a URL.

Multiple cross-site scripting (XSS) vulnerabilities in mod/lti/typessettings.php in Moodle 2.2.x before 2.2.4 and 2.3.x before 2.3.1 allow remote attackers to inject arbitrary web script or HTML via the (1) lti_typename or (2) lti_toolurl parameter.

lib/db/upgrade.php in Moodle 2.0.x before 2.0.5 and 2.1.x before 2.1.2 does not set the correct registration_hubs.secret value during installation, which allows remote attackers to bypass intended access restrictions by leveraging the hubs feature.

Moodle Cross Site Scripting (XSS)

Moodle Glossary search displays entries without checking user permissions to view them

mod/forum/post.php in Moodle 2.9.x before 2.9.1 does not consider the mod/forum:canposttomygroups capability before authorizing "Post a copy to all groups" actions, which allows remote authenticated users to bypass intended access restrictions by leveraging per-group authorization.

Moodle vulnerable to Cross-site Scripting

The Multi-Authentication feature in the Central Authentication Service (CAS) functionality in auth/cas/cas_form.html in Moodle 2.1.x before 2.1.6 and 2.2.x before 2.2.3 does not use HTTPS, which allows remote attackers to obtain credentials by sniffing the network.

Moodle allows attackers to obtain sensitive information

Moodle allows attackers to obtain sensitive calendar-event information

Moodle allows attackers obtain full-name information

** DISPUTED ** Moodle 4.3 allows /grade/report/grader/index.php?searchvalue= reflected XSS when logged in as a teacher. NOTE: the Moodle Security FAQ link states "Some forms of rich content [are] used by teachers to enhance their courses ... admins and teachers can post XSS-capable content, but students can not."

Moodle allows attackers to obtain sensitive course information

Moodle allows attackers to discover hidden course names