CVE-2018-19789: An issue was discovered in Symfony 2.7.x before 2.7.50, 2.8.x before 2.8.49, 3.x before 3.4.20, 4.0.x before 4.0.15, 4.1.x before 4.1.9, and 4.2.x bef...

Description

An issue was discovered in Symfony 2.7.x before 2.7.50, 2.8.x before 2.8.49, 3.x before 3.4.20, 4.0.x before 4.0.15, 4.1.x before 4.1.9, and 4.2.x before 4.2.1. When using the scalar type hint `string` in a setter method (e.g. `setName(string $name)`) of a class that's the `data_class` of a form, and when a file upload is submitted to the corresponding field instead of a normal text input, then `UploadedFile::__toString()` is called which will then return and disclose the path of the uploaded file. If combined with a local file inclusion issue in certain circumstances this could escalate it to a Remote Code Execution.

Metrics

EPSS Probability

3.59%

88.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Sensiolabs	Symfony	>= 2.7.0, < 2.7.50
Sensiolabs	Symfony	>= 2.8.0, < 2.8.49
Sensiolabs	Symfony	>= 3.0.0, < 3.4.20
Sensiolabs	Symfony	>= 4.0.0, < 4.0.15
Sensiolabs	Symfony	>= 4.1.0, < 4.1.9
Sensiolabs	Symfony	>= 4.2.0, < 4.2.1
Debian	Debian Linux	8.0

References

Timeline

Published: Dec 18, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-19789?

An issue was discovered in Symfony 2.7.x before 2.7.50, 2.8.x before 2.8.49, 3.x before 3.4.20, 4.0.x before 4.0.15, 4.1.x before 4.1.9, and 4.2.x before 4.2.1. When using the scalar type hint `string` in a setter method (e.g. `setName(string $name)`) of a class that's the `data_class` of a form, and when a file upload is submitted to the corresponding field instead of a normal text input, then `UploadedFile::__toString()` is called which will then return and disclose the path of the uploaded file. If combined with a local file inclusion issue in certain circumstances this could escalate it to a Remote Code Execution.

How severe is CVE-2018-19789?

Severity scoring for CVE-2018-19789 is pending analysis. The EPSS model estimates a 3.59% probability of exploitation in the next 30 days.

How do I fix CVE-2018-19789?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.