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Add caution on the framework kernel secret #16052

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Nov 2, 2021
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Add caution on the framework kernel secret #16052

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5 changes: 5 additions & 0 deletions reference/configuration/framework.rst
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Expand Up @@ -37,6 +37,11 @@ used to add more entropy to security related operations. Its value should
be a series of characters, numbers and symbols chosen randomly and the
recommended length is around 32 characters.

.. caution::

This configuration option's value is a real secret. You should treat it
with a lot of care.

In practice, Symfony uses this value for encrypting the cookies used
in the :doc:`remember me functionality </security/remember_me>` and for
creating signed URIs when using :ref:`ESI (Edge Side Includes) <edge-side-includes>`.
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