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Moodle vulnerable to brute-force password guesses

High severity GitHub Reviewed Published Oct 23, 2025 to the GitHub Advisory Database • Updated Oct 24, 2025

Package

composer moodle/moodle (Composer)

Affected versions

>= 5.0.0-beta, < 5.0.3
>= 4.5.0-beta, < 4.5.7
>= 4.2.0-beta, < 4.4.11
< 4.1.21

Patched versions

5.0.3
4.5.7
4.4.11
4.1.21

Description

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

References

Published by the National Vulnerability Database Oct 23, 2025
Published to the GitHub Advisory Database Oct 23, 2025
Reviewed Oct 24, 2025
Last updated Oct 24, 2025

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(26th percentile)

Weaknesses

Improper Restriction of Excessive Authentication Attempts

The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame, making it more susceptible to brute force attacks. Learn more on MITRE.

CVE ID

CVE-2025-62399

GHSA ID

GHSA-m58f-9pvv-8mp2

Source code

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