CVE-2018-19789

Status: ModifiedMedium (5.3)—

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.

CVSS

Version: 3.0
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Base score: 5.3

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 3.59%
Percentile among all scored CVEs: 89
Score date: 10/7/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (2)

Debian — Debian Linux Sensiolabs — Symfony

CWEs

CWE-434

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2018-19789",
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      "value": "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."
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      "value": "Se ha descubierto un problema en Symfony en versiones 2.7.x anteriores a la 2.7.50, versiones 2.8.x anteriores a la 2.8.49, versiones 3.x anteriores a la 3.4.20, versiones 4.0.x anteriores a la 4.0.15, versiones 4.1.x anteriores a la 4.1.9 y versiones 4.2.x anteriores a la 4.2.1. Al emplear la lista de ripo escalar \"string\" en un método setter (por ejemplo, \"setName(string $name)\") de una clase que es el \"data_class\" de un formulario, y cuando se envía una subida de archivos al campo correspondiente en lugar de una entrada de texto normal, se llama a \"UploadedFile::__toString()\", lo que devolverá y revelará la ruta del archivo subido. En determinadas circunstancias, si se combina con un problema de inclusión de archivos locales, podría escalarse a una ejecución remota de código."
    }
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  "lastModified": "2026-06-17T01:49:53.127",
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