CVE-2019-19745

Workarounds

Configure your web server so it does not execute PHP files and other scripts in the Contao file upload directory.

References

https://contao.org/en/security-advisories/unrestricted-file-uploads

For more information

If you have any questions or comments about this advisory, open an issue in contao/contao.

A back end user with access to the form generator can upload arbitrary files and execute them on the server.

The application accepts file uploads without adequately restricting the file type or content. Typical impact: remote code execution if the uploaded file can be served and executed on the server.

CVE-2019-19745 has a CVSS score of 8.8 (High). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (4.4.46, 4.8.6); upgrading removes the vulnerable code path.

Kodem intelligence

Update to Contao 4.4.46 or 4.8.6.

1. What is CVE-2019-19745? CVE-2019-19745 is a high-severity unrestricted upload of dangerous file types vulnerability in contao/core-bundle (composer), affecting versions >= 4.0.0, < 4.4.46. It is fixed in 4.4.46, 4.8.6. The application accepts file uploads without adequately restricting the file type or content.
2. How severe is CVE-2019-19745? CVE-2019-19745 has a CVSS score of 8.8 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which packages are affected by CVE-2019-19745?
   • contao/core-bundle (composer) (versions >= 4.0.0, < 4.4.46)
   • contao/contao (composer) (versions >= 4.0.0, < 4.4.46)
4. Is there a fix for CVE-2019-19745? Yes. CVE-2019-19745 is fixed in 4.4.46, 4.8.6. Upgrade to this version or later.
5. Is CVE-2019-19745 exploitable, and should I be worried? Whether CVE-2019-19745 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2019-19745 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2019-19745?
   • Upgrade contao/core-bundle to 4.4.46 or later
   • Upgrade contao/core-bundle to 4.8.6 or later
   • Upgrade contao/contao to 4.4.46 or later
   • Upgrade contao/contao to 4.8.6 or later