1 files changed, 13 insertions, 2 deletions
diff --git a/lib/private/preview.php b/lib/private/preview.php
index e9bfb3b9285..00f18219531 100755
--- a/lib/private/preview.php
+++ b/lib/private/preview.php
@@ -814,8 +814,19 @@ class Preview {
 			self::initProviders();
 		}
 
-		foreach (self::$providers as $supportedMimeType => $provider) {
-			if (preg_match($supportedMimeType, $mimeType)) {
+		// FIXME: Ugly hack to prevent SVG of being returned if the SVG
+		// provider is not enabled.
+		// This is required because the preview system is designed in a
+		// bad way and relies on opt-in with asterisks (i.e. image/*)
+		// which will lead to the fact that a SVG will also match the image
+		// provider.
+		if($mimeType === 'image/svg+xml' && !array_key_exists('/image\/svg\+xml/', self::$providers)) {
+			return false;
+		}
+
+		//remove last element because it has the mimetype *
+		foreach(self::$providers as $supportedMimetype => $provider) {
+			if(preg_match($supportedMimetype, $mimeType)) {
 				return true;
 			}
 		}