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.

End of life: 10/4/2027, End of support: 4/19/2027, Latest version: 5.2.2

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 vulnerability was found in a Moodle TeX filter administrative setting where insufficient sanitization of configuration input could allow command injection. On sites where the TeX filter is enabled and ImageMagick is installed, a maliciously crafted setting value entered by an administrator could result in unintended system command execution. While exploitation requires administrative privileges, successful compromise could affect the entire Moodle server.

A flaw was identified in Moodle’s backup restore functionality where specially crafted backup files were not properly validated during processing. If a malicious backup file is restored, it could lead to unintended execution of server-side code. Since restore capabilities are typically available to privileged users, exploitation requires authenticated access. Successful exploitation could result in full compromise of the Moodle server.

A Remote Code Execution vulnerability exists in Moodle’s file restore functionality due to insufficient validation of backup file contents during the restore process. An authenticated user with restore permissions can upload a specially crafted Moodle backup archive that may trigger execution of arbitrary PHP code when processed by the server. Successful exploitation could result in complete compromise of the Moodle instance, including unauthorized access to data, system modification, or service disruption.

A flaw was found in Moodle. An attacker with access to the restore interface could trigger server-side execution of arbitrary code. This is due to insufficient validation of restore input, which leads to unintended interpretation by core restore routines. Successful exploitation could result in a full compromise of the Moodle application.

Moodle 3.10.3 contains a persistent cross-site scripting vulnerability in the calendar event subtitle field that allows attackers to inject malicious scripts. Attackers can craft a calendar event with malicious JavaScript in the subtitle track label to execute arbitrary code when users view the event.

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. An authorization logic flaw, specifically due to incomplete role checks during the badge awarding process, allowed badges to be granted without proper verification. This could enable unauthorized users to obtain badges they are not entitled to, potentially leading to privilege escalation or unauthorized access to certain features.

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 brute-force facilitation issue was present in the confirmation email service. Without proper rate limiting, this endpoint could help attackers enumerate or guess credentials with less resistance.

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.

A flaw was found in moodle. This formula injection vulnerability occurs when data fields are exported without proper escaping. A remote attacker could exploit this by providing malicious data that, when exported and opened in a spreadsheet, allows arbitrary formulas to execute. This can lead to compromised data integrity and unintended operations within the spreadsheet.

A flaw was found in moodle. This vulnerability, known as Cross-Site Scripting (XSS), occurs due to insufficient checks on user-provided data in the formula editor's arithmetic expression fields. A remote attacker could inject malicious code into these fields. When other users view these expressions, the malicious code would execute in their web browsers, potentially compromising their data or leading to unauthorized actions.

A cross-site scripting (XSS) vulnerability existed due to improper sanitization of AI prompt responses. Attackers could inject HTML or script into pages viewed by other users, potentially leading to session theft or UI manipulation

A flaw was found in Moodle. This authentication bypass vulnerability allows suspended users to authenticate through the Learning Tools Interoperability (LTI) Provider. The issue arises from the LTI authentication handlers failing to enforce the user's suspension status, enabling unauthorized access to the system. This can lead to information disclosure or other unauthorized actions by users who should be restricted.

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.

Cross site scripting vulnerability in Moodle GeniAI plugin (localgeniai) 2.3.6. An authenticated user with Teacher role can upload a PDF containing embedded JavaScript. The assistant outputs a direct HTML link to the uploaded file without sanitization. When other users (including Students or Administrators) click the link, the payload executes in their browser.

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

Authentication endpoints for the mobile client and authwebservice allowed unlimited or insufficiently throttled password attempts. This could enable attackers to systematically guess passwords for known usernames.

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.

A flaw in the cohort search web service allowed users with permissions in lower contexts to access cohort information from the system context, revealing restricted administrative data.

Due to insufficient enrolment validation, quiz notifications could be sent to users with inactive or suspended enrolments. This information disclosure occurs automatically through the notification system and can reveal limited details about ongoing assessments.

Versions affected: 5.0 to 5.0.2 and 4.5 to 4.5.6 Versions fixed: 5.0.3 and 4.5.7

A flaw was found in the course overview output function where user access permissions were not fully enforced. This could allow unauthorized users to view information about courses they should not have access to, potentially exposing limited course details.