A flaw was found in Moodle. Insufficient escaping of the username on the password reset page allowed a minor cross-site scripting (XSS) risk if an unauthenticated user was tricked into opening a crafted password reset link. The reporter states this did not affect authenticated user sessions; that disclaimer is reflected in the impact assessment here.

A flaw was found in Moodle. When enrolling a user into a course while assigning them to a group, the application does not verify whether the selected group actually belongs to that course. An authenticated user with teacher privileges could exploit this flaw to add users to groups within courses they do not have authorization to access.

A flaw was found in Moodle. The XML grade import feature lacks proper Cross-Site Request Forgery (CSRF) token validation. By tricking an authenticated user with grade management permissions into visiting a malicious webpage, an attacker can trigger unauthorized requests on the victim's behalf. This flaw allows a remote attacker to set or overwrite student grades without authorization.

A flaw was found in Moodle. When enrolling a user into a course while selecting a group, a check that the selected group actually belonged to that course was missing, allowing a teacher to add users to groups in courses the teacher could not otherwise access.

A flaw was found in Moodle. Insufficient escaping of the username on the password reset page allowed a minor cross-site scripting (XSS) risk if an unauthenticated user was tricked into opening a crafted password reset link. The reporter states this did not affect authenticated user sessions; that disclaimer is reflected in the impact assessment here.

A flaw was found in Moodle. The XML grade import functionality, which allows setting or overwriting of student grades, did not include the token required to prevent a cross-site request forgery (CSRF) risk, allowing an attacker to overwrite grades on behalf of a logged-in victim who visits a malicious page.

A flaw was found in Moodle. Insufficient escaping in templates used to display forum posts resulted in a cross-site scripting (XSS) risk, allowing a stored script to execute in the browser of another user who views the affected forum post.

A flaw was found in Moodle. The manual enrolment management page did not correctly observe the disabled state of the manual enrolment plugin, allowing direct access to the page when the plugin was disabled and no longer linked from the UI. The relevant enrolment capability was still required to access the page, limiting the practical impact.

A flaw was found in Moodle. An authenticated attacker can supply an improperly validated audience class name to the Report Builder component, allowing arbitrary class instantiation. This vulnerability enables the unauthorized creation of internal program objects, which may result in unexpected application behavior.

A flaw was found in Moodle. Due to a missing capability check, a low-privileged authenticated user can trigger the recalculation of grade penalties without holding the required permissions. This issue allows unauthorized users to modify grade penalty records, potentially altering student assessment scores.

A flaw was found in Moodle. Missing capability checks made it possible for a low-privileged authenticated user to trigger grade penalty recalculation without holding the capability normally required to do so.

A flaw was found in Moodle. Insufficient escaping in templates used to display forum posts resulted in a cross-site scripting (XSS) risk, allowing a stored script to execute in the browser of another user who views the affected forum post.

A flaw was found in Moodle. An incorrect capability check in the grade web service allows an authenticated student to access profile information of other students enrolled in the same course that they should not have permission to view. This issue leads to unauthorized information disclosure.

A flaw was found in Moodle's grade web service. An incorrect capability check allowed a student to access profile information of other students enrolled in the same course, which they would not otherwise have access to.

A flaw was found in Moodle. A SQL injection risk was identified in a question bank web service, allowing unsanitized input to reach a database query. The advisory does not state the exact capability required to call the affected web service function; this draft assumes it requires an elevated (teacher-level) role rather than being reachable by a basic authenticated user.

A flaw was found in Moodle. Incorrect handling of IPv4-mapped IPv6 addresses within the URL downloader's host-blocking logic allows an authenticated remote user to bypass blocked-host restrictions. By supplying a crafted URL, an attacker can induce the server to make requests to restricted destinations, leading to Server-Side Request Forgery (SSRF).

A flaw was found in Moodle's URL downloader. Incorrect handling of IPv4-mapped IPv6 addresses in the host-blocking logic allows an authenticated user to bypass some blocked-host restrictions, resulting in a server-side request forgery (SSRF) risk when the downloader fetches a crafted URL. No further impact beyond partial blocklist bypass has been demonstrated.

Moodle LMS 4.0 contains a cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by submitting payloads through the search parameter. Attackers can inject JavaScript code via the search field in course/search.php to execute arbitrary scripts in users' browsers and steal session cookies.

A Denial of Service vulnerability was identified in Moodle’s TeX formula editor. When rendering TeX content using mimetex, insufficient execution time limits could allow specially crafted formulas to consume excessive server resources. An authenticated user could abuse this behavior to degrade performance or cause service interruption.

A Denial-of-Service vulnerability exists in Moodle’s TeX formula editor due to missing execution time controls during TeX rendering with mimetex. An authenticated user can submit specially crafted TeX content that causes excessive CPU consumption, resulting in degraded performance or service outage. While confidentiality and integrity are not impacted, availability of the Moodle instance may be significantly affected.

A data exposure issue existed where user identifiers were visible in URLs during anonymous assignment submissions, contrary to expected anonymity protections. This could reveal internal IDs to unauthorized viewers.

A flaw was found in Moodle. A remote attacker could exploit a reflected Cross-Site Scripting (XSS) vulnerability in the policy tool return URL. This vulnerability arises from insufficient sanitization of URL parameters, allowing attackers to inject malicious scripts through specially crafted links. Successful exploitation could lead to information disclosure or arbitrary client-side script execution within the user's browser.

A flaw was found in Moodle. An open redirect vulnerability in the OAuth login flow allows a remote attacker to redirect users to attacker-controlled pages after they have successfully authenticated. This occurs due to insufficient validation of redirect parameters, which could lead to phishing attacks or information disclosure.

Moodle PDF Annotator plugin v1.5 release 9 allows stored cross-site scripting (XSS) via the Public Comments feature. An attacker with a low-privileged account (e.g., Student) can inject arbitrary JavaScript payloads into a comment. When any other user (Student, Teacher, or Admin) views the annotated PDF, the payload is executed in their browser, leading to session hijacking, credential theft, or other attacker-controlled actions.

Moodle OpenAI Chat Block plugin 3.0.1 (2025021700) suffers from an Insecure Direct Object Reference (IDOR) vulnerability due to insufficient validation of the blockId parameter in /blocks/openaichat/api/completion.php. An authenticated student can impersonate another user's block (e.g., administrator) and send queries that are executed with that block's configuration. This can expose administrator-only Source of Truth entries, alter model behavior, and potentially misuse API resources.

An issue in Moodle's timed assignment feature allowed students to bypass the time restriction, potentially giving them more time than allowed to complete an assessment.

A missing capability check in the calendar event creation flow allows users with event creation rights to see names of hidden or separate groups. This may expose group names meant to remain private within a course.

Versions affected: 5.0 to 5.0.2, 4.5 to 4.5.6, 4.4 to 4.4.10, 4.1 to 4.1.20 and earlier unsupported versions Versions fixed: 5.0.3, 4.5.7, 4.4.11 and 4.1.21

A serious authentication flaw allowed attackers with valid credentials to bypass multi-factor authentication under certain conditions, potentially compromising user accounts.

The router’s inconsistent response to invalid course IDs allowed attackers to infer which course IDs exist, potentially aiding reconnaissance.

An error-handling issue in the Moodle router (r.php) could cause the application to display internal directory listings when specific HTTP headers were not properly configured.