CVE-2021-36397 Moodle has Incorrect Default Permissions

What is CVE-2021-36397?

CVE-2021-36397 is a medium-severity missing authorization vulnerability in Moodle Moodle, published on 6 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In Moodle, insufficient capability checks meant message deletions were not limited to the current user.

Weakness: CWE-276

Which versions are affected by CVE-2021-36397?

7 open source packages ship an affected version, including moodle/moodle and moodle. It affects 1 product.

Products include Moodle Moodle.

How do I fix CVE-2021-36397?

Upgrade moodle/moodle to a fixed version for your release line: 3.9.8, 3.10.5 or 3.11.1.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2021-36397 being exploited?

There is no known exploitation of CVE-2021-36397 in the wild and no public exploit code.

Other vulnerabilities in Moodle Moodle

• CVE-2006-4935 File upload in n/a Critical 10.0
• CVE-2006-4936 Moodle does not properly validate module instance id Critical 10.0
• CVE-2004-2233 Unknown "front page vulnerability with Moodle servers" for Moodle before 1.3.2 has unknown impact and attack vectors. Critical 10.0
• CVE-2004-2235 Cross-site scripting in n/a Critical 10.0
• CVE-2004-2236 Other in n/a Critical 10.0

All Moodle Moodle vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-moodle-2021-36397, GHSA-2wmj-8mqg-r9q8, UBUNTU-CVE-2021-36397.