diff --git a/apps/files_sharing/lib/Controller/ShareAPIController.php b/apps/files_sharing/lib/Controller/ShareAPIController.php
index 990571b778..1e121d8c86 100644
--- a/apps/files_sharing/lib/Controller/ShareAPIController.php
+++ b/apps/files_sharing/lib/Controller/ShareAPIController.php
@@ -35,8 +35,10 @@ use OCP\AppFramework\OCS\OCSException;
 use OCP\AppFramework\OCS\OCSForbiddenException;
 use OCP\AppFramework\OCS\OCSNotFoundException;
 use OCP\AppFramework\OCSController;
+use OCP\Constants;
 use OCP\Files\Node;
 use OCP\Files\NotFoundException;
+use OCP\IConfig;
 use OCP\IGroupManager;
 use OCP\IL10N;
 use OCP\IUserManager;
@@ -75,6 +77,8 @@ class ShareAPIController extends OCSController {
 	private $l;
 	/** @var \OCP\Files\Node */
 	private $lockedNode;
+	/** @var IConfig */
+	private $config;
 
 	/**
 	 * Share20OCS constructor.
@@ -88,6 +92,7 @@ class ShareAPIController extends OCSController {
 	 * @param IURLGenerator $urlGenerator
 	 * @param string $userId
 	 * @param IL10N $l10n
+	 * @param IConfig $config
 	 */
 	public function __construct(
 		$appName,
@@ -98,7 +103,8 @@ class ShareAPIController extends OCSController {
 		IRootFolder $rootFolder,
 		IURLGenerator $urlGenerator,
 		$userId,
-		IL10N $l10n
+		IL10N $l10n,
+		IConfig $config
 	) {
 		parent::__construct($appName, $request);
 
@@ -110,6 +116,7 @@ class ShareAPIController extends OCSController {
 		$this->urlGenerator = $urlGenerator;
 		$this->currentUser = $userId;
 		$this->l = $l10n;
+		$this->config = $config;
 	}
 
 	/**
@@ -318,7 +325,7 @@ class ShareAPIController extends OCSController {
 	 */
 	public function createShare(
 		$path = null,
-		$permissions = \OCP\Constants::PERMISSION_ALL,
+		$permissions = null,
 		$shareType = -1,
 		$shareWith = null,
 		$publicUpload = 'false',
@@ -327,6 +334,10 @@ class ShareAPIController extends OCSController {
 	) {
 		$share = $this->shareManager->newShare();
 
+		if ($permissions === null) {
+			$permissions = $this->config->getAppValue('core', 'shareapi_default_permissions', Constants::PERMISSION_ALL);
+		}
+
 		// Verify path
 		if ($path === null) {
 			throw new OCSNotFoundException($this->l->t('Please specify a file or folder path'));
@@ -347,17 +358,17 @@ class ShareAPIController extends OCSController {
 			throw new OCSNotFoundException($this->l->t('Could not create share'));
 		}
 
-		if ($permissions < 0 || $permissions > \OCP\Constants::PERMISSION_ALL) {
+		if ($permissions < 0 || $permissions > Constants::PERMISSION_ALL) {
 			throw new OCSNotFoundException($this->l->t('invalid permissions'));
 		}
 
 		// Shares always require read permissions
-		$permissions |= \OCP\Constants::PERMISSION_READ;
+		$permissions |= Constants::PERMISSION_READ;
 
 		if ($path instanceof \OCP\Files\File) {
 			// Single file shares should never have delete or create permissions
-			$permissions &= ~\OCP\Constants::PERMISSION_DELETE;
-			$permissions &= ~\OCP\Constants::PERMISSION_CREATE;
+			$permissions &= ~Constants::PERMISSION_DELETE;
+			$permissions &= ~Constants::PERMISSION_CREATE;
 		}
 
 		/*
@@ -414,13 +425,13 @@ class ShareAPIController extends OCSController {
 				}
 
 				$share->setPermissions(
-					\OCP\Constants::PERMISSION_READ |
-					\OCP\Constants::PERMISSION_CREATE |
-					\OCP\Constants::PERMISSION_UPDATE |
-					\OCP\Constants::PERMISSION_DELETE
+					Constants::PERMISSION_READ |
+					Constants::PERMISSION_CREATE |
+					Constants::PERMISSION_UPDATE |
+					Constants::PERMISSION_DELETE
 				);
 			} else {
-				$share->setPermissions(\OCP\Constants::PERMISSION_READ);
+				$share->setPermissions(Constants::PERMISSION_READ);
 			}
 
 			// Set password
@@ -447,13 +458,9 @@ class ShareAPIController extends OCSController {
 			$share->setPermissions($permissions);
 		} else if ($shareType === \OCP\Share::SHARE_TYPE_EMAIL) {
 			if ($share->getNodeType() === 'file') {
-				$share->setPermissions(\OCP\Constants::PERMISSION_READ);
+				$share->setPermissions(Constants::PERMISSION_READ);
 			} else {
-				$share->setPermissions(
-					\OCP\Constants::PERMISSION_READ |
-					\OCP\Constants::PERMISSION_CREATE |
-					\OCP\Constants::PERMISSION_UPDATE |
-					\OCP\Constants::PERMISSION_DELETE);
+				$share->setPermissions($permissions);
 			}
 			$share->setSharedWith($shareWith);
 		} else if ($shareType === \OCP\Share::SHARE_TYPE_CIRCLE) {
@@ -698,23 +705,23 @@ class ShareAPIController extends OCSController {
 
 			$newPermissions = null;
 			if ($publicUpload === 'true') {
-				$newPermissions = \OCP\Constants::PERMISSION_READ | \OCP\Constants::PERMISSION_CREATE | \OCP\Constants::PERMISSION_UPDATE | \OCP\Constants::PERMISSION_DELETE;
+				$newPermissions = Constants::PERMISSION_READ | Constants::PERMISSION_CREATE | Constants::PERMISSION_UPDATE | Constants::PERMISSION_DELETE;
 			} else if ($publicUpload === 'false') {
-				$newPermissions = \OCP\Constants::PERMISSION_READ;
+				$newPermissions = Constants::PERMISSION_READ;
 			}
 
 			if ($permissions !== null) {
 				$newPermissions = (int)$permissions;
-				$newPermissions = $newPermissions & ~\OCP\Constants::PERMISSION_SHARE;
+				$newPermissions = $newPermissions & ~Constants::PERMISSION_SHARE;
 			}
 
 			if ($newPermissions !== null &&
 				!in_array($newPermissions, [
-					\OCP\Constants::PERMISSION_READ,
-					\OCP\Constants::PERMISSION_READ | \OCP\Constants::PERMISSION_CREATE | \OCP\Constants::PERMISSION_UPDATE, // legacy
-					\OCP\Constants::PERMISSION_READ | \OCP\Constants::PERMISSION_CREATE | \OCP\Constants::PERMISSION_UPDATE | \OCP\Constants::PERMISSION_DELETE, // correct
-					\OCP\Constants::PERMISSION_CREATE, // hidden file list
-					\OCP\Constants::PERMISSION_READ | \OCP\Constants::PERMISSION_UPDATE, // allow to edit single files
+					Constants::PERMISSION_READ,
+					Constants::PERMISSION_READ | Constants::PERMISSION_CREATE | Constants::PERMISSION_UPDATE, // legacy
+					Constants::PERMISSION_READ | Constants::PERMISSION_CREATE | Constants::PERMISSION_UPDATE | Constants::PERMISSION_DELETE, // correct
+					Constants::PERMISSION_CREATE, // hidden file list
+					Constants::PERMISSION_READ | Constants::PERMISSION_UPDATE, // allow to edit single files
 				])
 			) {
 				throw new OCSBadRequestException($this->l->t('Can\'t change permissions for public share links'));
@@ -722,9 +729,9 @@ class ShareAPIController extends OCSController {
 
 			if (
 				// legacy
-				$newPermissions === (\OCP\Constants::PERMISSION_READ | \OCP\Constants::PERMISSION_CREATE | \OCP\Constants::PERMISSION_UPDATE) ||
+				$newPermissions === (Constants::PERMISSION_READ | Constants::PERMISSION_CREATE | Constants::PERMISSION_UPDATE) ||
 				// correct
-				$newPermissions === (\OCP\Constants::PERMISSION_READ | \OCP\Constants::PERMISSION_CREATE | \OCP\Constants::PERMISSION_UPDATE | \OCP\Constants::PERMISSION_DELETE)
+				$newPermissions === (Constants::PERMISSION_READ | Constants::PERMISSION_CREATE | Constants::PERMISSION_UPDATE | Constants::PERMISSION_DELETE)
 			) {
 				if (!$this->shareManager->shareApiLinkAllowPublicUpload()) {
 					throw new OCSForbiddenException($this->l->t('Public upload disabled by the administrator'));
@@ -735,7 +742,7 @@ class ShareAPIController extends OCSController {
 				}
 
 				// normalize to correct public upload permissions
-				$newPermissions = \OCP\Constants::PERMISSION_READ | \OCP\Constants::PERMISSION_CREATE | \OCP\Constants::PERMISSION_UPDATE | \OCP\Constants::PERMISSION_DELETE;
+				$newPermissions = Constants::PERMISSION_READ | Constants::PERMISSION_CREATE | Constants::PERMISSION_UPDATE | Constants::PERMISSION_DELETE;
 			}
 
 			if ($newPermissions !== null) {