CVE-2025-62399: Moodle: password brute force risk when mobile/web services enabled

Severity: high (CVSS 7.5 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: 2025-10-23 · updated 2026-06-17
Weakness: CWE-307

Description

Moodle’s mobile and web service authentication endpoints did not sufficiently restrict repeated password attempts, making them susceptible to brute-force attacks.

Affected products

Moodle: from 4.1.0 before 4.1.21; from 4.4.0 before 4.4.11; from 4.5.0 before 4.5.7; from 5.0.0 before 5.0.3 — fixed in 4.1.21, 4.4.11, 4.5.7, 5.0.3

How to fix

Upgrade to a fixed version: Moodle 4.1.21, 4.4.11, 4.5.7, 5.0.3. Check the vendor advisory for mitigations.

References

https://access.redhat.com/security/cve/CVE-2025-62399
https://bugzilla.redhat.com/show_bug.cgi?id=2404432

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