CVE-2018-1082: Moodle Improper Authentication

moodle/moodle Updated 02 Oct 2025

Summary

13/05/2022

Disclosed on

CVE-2018-1082

CVE

Yes i

Fix available

High

Severity

8.1

CVSS Score

CVE-2018-1082: Moodle Improper Authentication. Affects moodle/moodle across 2 version ranges.

>= 3.3, < 3.3.5 >= 3.4, < 3.4.2

Fixed in 3.3.5 or 3.4.2, depending on the release line you run. How to fix ↓

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Background

Moodle is an open-source learning management system (LMS) used by educational institutions to create and manage online courses. It provides a platform for educators to deliver content, interact with students, and assess their progress. Moodle supports various authentication methods, including OAuth2. However, a vulnerability has been identified in Moodle versions 3.3 to 3.3.4 and 3.4 to 3.4.1, which allows users with suspended OAuth2 accounts to still log in to the site.

Vulnerability Detail

The vulnerability arises when a user account using OAuth2 authentication is confirmed but later suspended. Despite being suspended, the user can still authenticate and access the Moodle site. This improper authentication can lead to unauthorized access to sensitive information, manipulation of course content, and potential data breaches. The vulnerability has a CVSS score of 8.1, indicating a high severity level.

How To Fix

Fixed versions by release line

The minimum fixed version depends on the release line you run.

>= 3.3, < 3.3.5 3.3.5
```
composer require moodle/moodle:3.3.5
```
>= 3.4, < 3.4.2 3.4.2
```
composer require moodle/moodle:3.4.2
```

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Workaround

There is no specific workaround mentioned for this vulnerability. It is essential to apply the recommended fix by upgrading to the patched versions of Moodle.

Conclusion

The vulnerability in Moodle versions 3.3 to 3.3.4 and 3.4 to 3.4.1 allows users with suspended OAuth2 accounts to authenticate and access the site. To mitigate this issue, it is crucial to upgrade to the patched versions of Moodle. For further assistance and support in vulnerability remediation, please contact DevNack.com.

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