CVE-2025-3645 Moodle: idor in messaging web service allows access to some user details

What is CVE-2025-3645?

CVE-2025-3645 is a medium-severity missing authorization vulnerability in Moodle Moodle, published on 25 Apr 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A flaw was found in Moodle. Insufficient capability checks in a messaging web service allowed users to view other users' names and online statuses.

Weakness: CWE-863

Which versions are affected by CVE-2025-3645?

9 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-2025-3645?

Upgrade moodle/moodle to a fixed version for your release line: 4.1.18, 4.3.12, 4.4.8 or 4.5.4.

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

Is CVE-2025-3645 being exploited?

There is no known exploitation of CVE-2025-3645 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-2025-3645, GHSA-pj96-xh2w-fgqx, UBUNTU-CVE-2025-3645.