Auth bypass in Moodle
CVE-2025-3634
A security vulnerability was discovered in Moodle that allows students to enroll themselves in courses without completing all the necessary safety checks. Specifically, users can sign up for courses prematurely, even if they haven't finished two-step verification processes.
Vulnerability class: Broken Authentication
EPSS: 0.002 (16.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- patrick@puiterwijk.org (x_refsource_REDHAT, Third Party Advisory, vdb-entry)
- patrick@puiterwijk.org (x_refsource_REDHAT, issue-tracking, Issue Tracking)
Frequently asked questions
- What is CVE-2025-3634?
- CVE-2025-3634 is a medium-severity vulnerability in Moodle, classified under Improper Authentication. CVSS score: 4.3/10. Published 2025-04-25.
- How severe is CVE-2025-3634?
- Medium severity. CVSS v3 base score is 4.3 out of 10.
- Is CVE-2025-3634 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.