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docs: warn against user-controlled image paths #10325

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8 changes: 8 additions & 0 deletions user_guide_src/source/libraries/images.rst
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Expand Up @@ -42,6 +42,14 @@ The available Handlers are as follows:
On Windows, the ImageMagick handler requires **absolute file paths** when
loading images (for example, using ``WRITEPATH`` or ``FCPATH``).

.. warning::
Do not let user input directly decide the image source path, storage
directory, or filename. This includes values passed to methods like
``save()``, ``copy()`` and others, and any path or filename used to store
processed images. Use directories controlled by your application, and
generate filenames yourself or sanitize them with
:php:func:`sanitize_filename`.

*******************
Processing an Image
*******************
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