CVE-2025-3640: Moodle: idor in web service allows users enrolled in a course to access some details of other users

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-04-25 · updated 2026-06-17
Weakness: CWE-639

Description

A flaw was found in Moodle. Insufficient capability checks made it possible for a user enrolled in a course to access some details, such as the full name and profile image URL, of other users they did not have permission to access.

Affected products

Moodle: before 4.1.18; from 4.3.0 before 4.3.12; from 4.4.0 before 4.4.8; from 4.5.0 before 4.5.4 — fixed in 4.1.18, 4.3.12, 4.4.8, 4.5.4

How to fix

Upgrade to a fixed version: Moodle 4.1.18, 4.3.12, 4.4.8, 4.5.4. Check the vendor advisory for mitigations.

References

https://access.redhat.com/security/cve/CVE-2025-3640
https://bugzilla.redhat.com/show_bug.cgi?id=2359734
https://moodle.org/mod/forum/discuss.php?d=467601

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