diff --git a/app/code/Magento/CatalogImportExport/Model/Export/Product.php b/app/code/Magento/CatalogImportExport/Model/Export/Product.php
index 2ae758cd4e44e..6ca73df206ae2 100644
--- a/app/code/Magento/CatalogImportExport/Model/Export/Product.php
+++ b/app/code/Magento/CatalogImportExport/Model/Export/Product.php
@@ -632,7 +632,7 @@ protected function updateDataWithCategoryColumns(&$dataRow, &$rowCategories, $pr
             }
             $categories[] = $categoryPath;
         }
-        $dataRow[self::COL_CATEGORY] = implode(ImportProduct::PSEUDO_MULTI_LINE_SEPARATOR, $categories);
+        $dataRow[self::COL_CATEGORY] = implode(ImportProduct::DEFAULT_GLOBAL_MULTI_VALUE_SEPARATOR, $categories);
         unset($rowCategories[$productId]);
 
         return true;
@@ -666,7 +666,7 @@ protected function setHeaderColumns($customOptionsData, $stockItemRows)
                     self::COL_ATTR_SET,
                     self::COL_TYPE,
                     self::COL_CATEGORY,
-                    '_product_websites',
+                    self::COL_PRODUCT_WEBSITES,
                 ],
                 $this->_getExportMainAttrCodes(),
                 [self::COL_ADDITIONAL_ATTRIBUTES],
@@ -1032,7 +1032,7 @@ protected function addMultirowData($dataRow, $multiRawData)
                 foreach ($multiRawData['rowWebsites'][$productId] as $productWebsite) {
                     $websiteCodes[] = $this->_websiteIdToCode[$productWebsite];
                 }
-                $dataRow['_product_websites'] =
+                $dataRow[self::COL_PRODUCT_WEBSITES] =
                     implode(ImportProduct::DEFAULT_GLOBAL_MULTI_VALUE_SEPARATOR, $websiteCodes);
                 $multiRawData['rowWebsites'][$productId] = [];
             }
diff --git a/app/code/Magento/CatalogImportExport/Model/Import/Product.php b/app/code/Magento/CatalogImportExport/Model/Import/Product.php
index 7f9a5d05af67c..2001d54f76db7 100755
--- a/app/code/Magento/CatalogImportExport/Model/Import/Product.php
+++ b/app/code/Magento/CatalogImportExport/Model/Import/Product.php
@@ -1372,7 +1372,9 @@ protected function _saveProducts()
                     }
                 }
 
-                $this->websitesCache[$rowSku] = [];
+                if (!array_key_exists($rowSku, $this->websitesCache)) {
+                    $this->websitesCache[$rowSku] = [];
+                }
                 // 2. Product-to-Website phase
                 if (!empty($rowData[self::COL_PRODUCT_WEBSITES])) {
                     $websiteCodes = explode($this->getMultipleValueSeparator(), $rowData[self::COL_PRODUCT_WEBSITES]);
@@ -1383,12 +1385,12 @@ protected function _saveProducts()
                 }
 
                 // 3. Categories phase
-                $categoriesString = empty($rowData[self::COL_CATEGORY]) ? '' : $rowData[self::COL_CATEGORY];
-                $this->categoriesCache[$rowSku] = [];
-                if (!empty($categoriesString)) {
-                    foreach ($this->categoryProcessor->upsertCategories($categoriesString) as $categoryId) {
-                        $this->categoriesCache[$rowSku][$categoryId] = true;
-                    }
+                $categoryIds = $this->processRowCategories($rowData);
+                if (!array_key_exists($rowData[Product::COL_SKU], $this->categoriesCache)) {
+                    $this->categoriesCache[$rowData[Product::COL_SKU]] = [];
+                }
+                foreach ($categoryIds as $id) {
+                    $this->categoriesCache[$rowData[Product::COL_SKU]][$id] = true;
                 }
 
                 // 4.1. Tier prices phase
@@ -1541,7 +1543,9 @@ protected function _saveProducts()
                         }
                     }
                     foreach ($storeIds as $storeId) {
-                        $attributes[$attrTable][$rowSku][$attrId][$storeId] = $attrValue;
+                        if (!isset($attributes[$attrTable][$rowSku][$attrId][$storeId])) {
+                            $attributes[$attrTable][$rowSku][$attrId][$storeId] = $attrValue;
+                        }
                     }
                     // restore 'backend_model' to avoid 'default' setting
                     $attribute->setBackendModel($backModel);
@@ -1574,7 +1578,24 @@ protected function _saveProducts()
     }
 
     /**
-     * @param $productSku
+     * @param array $rowData
+     * @return array
+     */
+    protected function processRowCategories($rowData)
+    {
+        $categoriesString = empty($rowData[self::COL_CATEGORY]) ? '' : $rowData[self::COL_CATEGORY];
+        $categoryIds = [];
+        if (!empty($categoriesString)) {
+            $categoryIds = $this->categoryProcessor->upsertCategories(
+                $categoriesString,
+                $this->getMultipleValueSeparator()
+            );
+        }
+        return $categoryIds;
+    }
+
+    /**
+     * @param string $productSku
      * @return array
      */
     public function getProductWebsites($productSku)
@@ -1583,7 +1604,7 @@ public function getProductWebsites($productSku)
     }
 
     /**
-     * @param $productSku
+     * @param string $productSku
      * @return array
      */
     public function getProductCategories($productSku)
@@ -1592,7 +1613,7 @@ public function getProductCategories($productSku)
     }
 
     /**
-     * @param $storeCode
+     * @param string $storeCode
      * @return array|int|null|string
      */
     public function getStoreIdByCode($storeCode)
@@ -2213,7 +2234,7 @@ private function _setStockUseConfigFieldsValues($rowData)
     private function _customFieldsMapping($rowData)
     {
         foreach ($this->_fieldsMap as $systemFieldName => $fileFieldName) {
-            if (isset($rowData[$fileFieldName])) {
+            if (array_key_exists($fileFieldName, $rowData)) {
                 $rowData[$systemFieldName] = $rowData[$fileFieldName];
             }
         }
@@ -2221,10 +2242,12 @@ private function _customFieldsMapping($rowData)
         $rowData = $this->_parseAdditionalAttributes($rowData);
 
         $rowData = $this->_setStockUseConfigFieldsValues($rowData);
-        if (isset($rowData['status'])) {
-            if (($rowData['status'] == \Magento\Catalog\Model\Product\Attribute\Source\Status::STATUS_ENABLED) || $rowData['status'] == 'yes') {
+        if (array_key_exists('status', $rowData)
+            && $rowData['status'] != \Magento\Catalog\Model\Product\Attribute\Source\Status::STATUS_ENABLED
+        ) {
+            if ($rowData['status'] == 'yes') {
                 $rowData['status'] = \Magento\Catalog\Model\Product\Attribute\Source\Status::STATUS_ENABLED;
-            } else {
+            } elseif (!empty($rowData['status']) || $this->getRowScope($rowData) == self::SCOPE_DEFAULT) {
                 $rowData['status'] = \Magento\Catalog\Model\Product\Attribute\Source\Status::STATUS_DISABLED;
             }
         }
diff --git a/app/code/Magento/CatalogImportExport/Model/Import/Product/CategoryProcessor.php b/app/code/Magento/CatalogImportExport/Model/Import/Product/CategoryProcessor.php
index 8fa6ecc7be945..e071467771a4c 100644
--- a/app/code/Magento/CatalogImportExport/Model/Import/Product/CategoryProcessor.php
+++ b/app/code/Magento/CatalogImportExport/Model/Import/Product/CategoryProcessor.php
@@ -7,11 +7,6 @@
 
 class CategoryProcessor
 {
-    /**
-     * Delimiter in import file between categories.
-     */
-    const DELIMITER_CATEGORIES = '|';
-
     /**
      * Delimiter in category path.
      */
@@ -144,13 +139,14 @@ protected function upsertCategory($categoryPath)
      * Returns IDs of categories by string path creating nonexistent ones.
      *
      * @param string $categoriesString
+     * @param string $categoriesSeparator
      *
      * @return array
      */
-    public function upsertCategories($categoriesString)
+    public function upsertCategories($categoriesString, $categoriesSeparator)
     {
         $categoriesIds = [];
-        $categories = explode(self::DELIMITER_CATEGORIES, $categoriesString);
+        $categories = explode($categoriesSeparator, $categoriesString);
 
         foreach ($categories as $category) {
             $categoriesIds[] = $this->upsertCategory($category);
diff --git a/app/code/Magento/CatalogImportExport/Model/Import/Product/Validator.php b/app/code/Magento/CatalogImportExport/Model/Import/Product/Validator.php
index 3301e3d9fa9c0..66e1efbc2d9a6 100644
--- a/app/code/Magento/CatalogImportExport/Model/Import/Product/Validator.php
+++ b/app/code/Magento/CatalogImportExport/Model/Import/Product/Validator.php
@@ -142,7 +142,7 @@ public function isAttributeValid($attrCode, array $attrParams, array $rowData)
                 $values = explode(Product::PSEUDO_MULTI_LINE_SEPARATOR, $rowData[$attrCode]);
                 $valid = true;
                 foreach ($values as $value) {
-                    $valid = $valid || isset($attrParams['options'][strtolower($value)]);
+                    $valid = $valid && isset($attrParams['options'][strtolower($value)]);
                 }
                 if (!$valid) {
                     $this->_addMessages(
diff --git a/app/code/Magento/CatalogImportExport/Model/Import/Uploader.php b/app/code/Magento/CatalogImportExport/Model/Import/Uploader.php
index a78e978d84c6f..f22d910ccd45e 100644
--- a/app/code/Magento/CatalogImportExport/Model/Import/Uploader.php
+++ b/app/code/Magento/CatalogImportExport/Model/Import/Uploader.php
@@ -223,7 +223,7 @@ protected function _validateFile()
                 && method_exists($params['object'], $params['method'])
                 && is_callable([$params['object'], $params['method']])
             ) {
-                $params['object']->{$params['method']}($filePath);
+                $params['object']->{$params['method']}($this->_directory->getAbsolutePath($filePath));
             }
         }
     }
@@ -314,4 +314,12 @@ protected function _moveFile($tmpPath, $destPath)
             return false;
         }
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function chmod($file)
+    {
+        return;
+    }
 }
diff --git a/app/code/Magento/CatalogImportExport/Test/Unit/Model/Import/Product/CategoryProcessorTest.php b/app/code/Magento/CatalogImportExport/Test/Unit/Model/Import/Product/CategoryProcessorTest.php
index e4ebc3069ef24..7a8bfeef19839 100644
--- a/app/code/Magento/CatalogImportExport/Test/Unit/Model/Import/Product/CategoryProcessorTest.php
+++ b/app/code/Magento/CatalogImportExport/Test/Unit/Model/Import/Product/CategoryProcessorTest.php
@@ -110,7 +110,7 @@ protected function setUp()
 
     public function testUpsertCategories()
     {
-        $categoryIds = $this->categoryProcessor->upsertCategories(self::CHILD_CATEGORY_NAME);
+        $categoryIds = $this->categoryProcessor->upsertCategories(self::CHILD_CATEGORY_NAME, ',');
         $this->assertArrayHasKey(self::CHILD_CATEGORY_ID, array_flip($categoryIds));
     }
 
diff --git a/app/code/Magento/CatalogImportExport/Test/Unit/Model/Import/Product/ValidatorTest.php b/app/code/Magento/CatalogImportExport/Test/Unit/Model/Import/Product/ValidatorTest.php
index c358decc64084..fad86286b1511 100755
--- a/app/code/Magento/CatalogImportExport/Test/Unit/Model/Import/Product/ValidatorTest.php
+++ b/app/code/Magento/CatalogImportExport/Test/Unit/Model/Import/Product/ValidatorTest.php
@@ -83,7 +83,8 @@ public function testIsBooleanAttributeValid()
             [
                 'type' => 'boolean',
                 'apply_to' => ['simple'],
-                'is_required' => false
+                'is_required' => false,
+                'options' => ['yes' => 0, 'no' => 1]
             ],
             [
                 'product_type' => 'simple',