File Upload API template parameter validation fix with PoC code

Summary of Key Vulnerability Information Vulnerability Overview Type: The parameter in the API upload pre-flight check is not properly validated, which may lead to anomalies in the file upload logic or permission bypasses. Commit Message: Committer: Bastian Allgaier Commit Hash: Scope of Impact Affected files: - - - - - Affected module: The pre-flight process of the file upload API, involving parameter handling and permission checks. Fix Details 1. : Added validation of the parameter in the callback to ensure its value is valid ("sane"), preventing upload failures or exceptions caused by invalid templates. 2. : Synchronized the fix for parameter handling logic in user-related routes. 3. : In the function, when is , the default value ( ) is used as the parent, avoiding errors caused by null values. 4. : In the method, added a null check for the parameter; if , the default template is used. 5. : - Initialized the property in the constructor. - In the method, validated the parameter; if , the default template is used. - In the method, performed a null check on the parameter; if , the default template is used. POC / Exploit Code `` files.php template upload` callback $callback = function ($source, $filename) use ($spare) { $spare = $this->uploadParent($spare) ?? null; $template = $spare['template'] ?? null; $groups = [ 'source' => $source, 'template' => $template, 'filename' => $filename, ]; // move the source file from the temp dir $file = $spare->createFile($groups, move: true); if ($file instanceof File === false) { throw new Exception( message: 'The file could not be uploaded' ); } return $spare->upload( callback: function ($source, $filename, $template) use ($spare, $spare) { $groups = [ 'source' => $source, 'template' => $template, 'filename' => $filename, ]; // move the source file from the temp dir $file = $spare->createFile($groups, move: true); if ($file instanceof File === false) { throw new Exception( message: 'The file could not be uploaded' ); } return $spare->upload( callback: function ($source, $filename, $template) use ($spare, $spare) { $groups = [ 'source' => $source, 'template' => $template, 'filename' => $filename, ]; // move the source file from the temp dir $file = $spare->createFile($groups, move: true); if ($file instanceof File === false) { throw new Exception( message: 'The file could not be uploaded' ); } return $spare->upload( callback: function ($source, $filename, $template) use ($spare, $spare) { $groups = [ 'source' => $source, 'template' => $template, 'filename' => $filename, ]; // move the source file from the temp dir $file = $spare->createFile($groups, move: true); if ($file instanceof File === false) { throw new Exception( message: 'The file could not be uploaded' ); } return $spare->upload( callback: function ($source, $filename, $template) use ($spare, $spare) { $groups = [ 'source' => $source, 'template' => $template, 'filename' => $filename, ]; // move the source file from the temp dir $file = $spare->createFile($groups, move: true); if ($file instanceof File === false) { throw new Exception( message: 'The file could not be uploaded' ); } return $spare->upload( callback: function ($source, $filename, $template) use ($spare, $spare) { $groups = [ 'source' => $source, 'template' => $template, 'filename' => $filename, ]; // move the source file from the temp dir $file = $spare->createFile($groups, move: true); if ($file instanceof File === false) { throw new Exception( message: 'The file could not be uploaded' ); } return $spare->upload( callback: function ($source, $filename, $template) use ($spare, $spare) { $groups = [ 'source' => $source, 'template' => $template, 'filename' => $filename, ]; // move the source file from the temp dir $file = $spare->createFile($groups, move: true); if ($file instanceof File === false) { throw new Exception( message: 'The file could not be uploaded' ); } return $spare->upload( callback: function ($source, $filename, $template) use ($spare, $spare) { $groups = [ 'source' => $source, 'template' => $template, 'filename' => $filename, ]; // move the source file from the temp dir $file = $spare->createFile($groups, move: true); if ($file instanceof File === false) { throw new Exception( message: 'The file could not be uploaded' ); } return $spare->upload( callback: function ($source, $filename, $template) use ($spare, $spare) { $groups = [ 'source' => $source, 'template' => $template, 'filename' => $filename, ]; // move the source file from the temp dir $file = $spare->createFile($groups, move: true); if ($file instanceof File === false) { throw new Exception( message: 'The file could not be uploaded' ); } return $spare->upload( callback: function ($source, $filename, $template) use ($spare, $spare) { $groups = [ 'source' => $source, 'template' => $template, 'filename' => $filename, ]; // move the source file from the temp dir $file = $spare->createFile($groups, move: true); if ($file instanceof File === false) { throw new Exception( message:

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File Upload API template parameter validation fix with PoC code

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