CVE-2021-20281 Moodle allowed some users without permission to view other users' full names

What is CVE-2021-20281?

CVE-2021-20281 is a medium-severity missing authorization vulnerability in Fedoraproject Fedora, published on 15 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

It was possible for some users without permission to view other users' full names to do so via the online users block in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.

Weakness: CWE-863, CWE-200

Which versions are affected by CVE-2021-20281?

9 open source packages ship an affected version, including moodle/moodle and moodle. It affects 2 products.

Products include Fedoraproject Fedora, Moodle Moodle.

How do I fix CVE-2021-20281?

Upgrade moodle/moodle to a fixed version for your release line: 3.10.2, 3.5.17, 3.8.8 or 3.9.5.

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

Is CVE-2021-20281 being exploited?

There is no known exploitation of CVE-2021-20281 in the wild and no public exploit code.

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• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

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

Also known as BIT-moodle-2021-20281, GHSA-93wh-35r4-6qmw, UBUNTU-CVE-2021-20281.