The improvement is still in the file administrator\components\com_virtuemart\views\product\tmpl\product_edit_information.php line ~43-45:
<td>
<input class="required inputbox" type="text" name="product_name" id="product_name" value="<?php echo $this->product->product_name; ?>" size="32" maxlength="255" />
</td>
Change to:
<td>
<input class="required inputbox" type="text" name="product_name" id="product_name" value="<?php echo htmlspecialchars($this->product->product_name); ?>" size="32" maxlength="255" />
</td>
Solve the problem of character display: ". ', [,]{,},<,>
The problem concerns the input element when the title product is the sign of an inch(char: "), is the re-editing does not display the title of the product.
The same file lines ~53-55:
<td height="18">
<input type="text" class="inputbox" name="slug" id="slug" value="<?php echo $this->product->slug; ?>" size="32" maxlength="255" />
</td>
Change to:
<td height="18">
<input type="text" class="inputbox" name="slug" id="slug" value="<?php echo htmlspecialchars($this->product->slug); ?>" size="32" maxlength="255" />
</td>