Description
A flaw was found in Moodle. When enrolling a user into a course while assigning them to a group, the application does not verify whether the selected group actually belongs to that course. An authenticated user with teacher privileges could exploit this flaw to add users to groups within courses they do not have authorization to access.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | moodle | 5.2.0 – < 5.2.2, 5.1.0 – < 5.1.6 | 5.2.2 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | moodle | No fix yet | — |
| Ubuntu Pro 16.04 LTS | moodle | No fix yet | — |
Advisories 1
- WID-SEC-2026-3686 Moodle: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 30, 2026