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Moodle exposed the names of hidden groups to users

Moderate 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 exposed the names of hidden groups to users who had permission to create calendar events but not to view hidden groups. This could reveal private or restricted group information.

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

Moderate

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

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:L/UI:N/S:U/C:L/I:N/A:N

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.
(6th percentile)

Weaknesses

Exposure of Sensitive Information to an Unauthorized Actor

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Learn more on MITRE.

CVE ID

CVE-2025-62400

GHSA ID

GHSA-422v-w6c5-vq42

Source code

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