diff --git a/src/document.js b/src/document.js
index 9f0d860e1d..f5e68db3bb 100644
--- a/src/document.js
+++ b/src/document.js
@@ -206,7 +206,7 @@ const documentsMain = {
 				+ '</form>'
 
 			// iframe that contains the Collabora Online Viewer
-			const frame = '<iframe data-cy="coolframe" id="loleafletframe" name="loleafletframe_viewer" allowfullscreen nonce="' + btoa(getRequestToken()) + '" style="width:100%;height:100%;position:absolute;"/>'
+			const frame = '<iframe data-cy="coolframe" id="loleafletframe" name="loleafletframe_viewer" allowfullscreen allow="clipboard-read *; clipboard-write *" nonce="' + btoa(getRequestToken()) + '" style="width:100%;height:100%;position:absolute;"/>'
 
 			$('#revViewer').append(form)
 			$('#revViewer').append(frame)
@@ -266,7 +266,7 @@ const documentsMain = {
 				+ '</form>'
 
 			// iframe that contains the Collabora Online
-			const frame = '<iframe data-cy="coolframe" id="loleafletframe" name="loleafletframe" nonce="' + btoa(getRequestToken()) + '" scrolling="no" allowfullscreen style="width:100%;height:100%;position:absolute;" />'
+			const frame = '<iframe data-cy="coolframe" id="loleafletframe" name="loleafletframe" nonce="' + btoa(getRequestToken()) + '" scrolling="no" allowfullscreen allow="clipboard-read *; clipboard-write *" style="width:100%;height:100%;position:absolute;" />'
 
 			$('#mainContainer').append(form)
 			$('#mainContainer').append(frame)
diff --git a/src/files.js b/src/files.js
index 3eb5b6b710..c3b3dc2dea 100644
--- a/src/files.js
+++ b/src/files.js
@@ -95,7 +95,7 @@ const odfViewer = {
 
 		$('head').append($('<link rel="stylesheet" type="text/css" href="' + generateFilePath('richdocuments', 'css', 'mobile.css') + '"/>'))
 
-		const $iframe = $('<iframe data-cy="documentframe" id="richdocumentsframe" nonce="' + btoa(OC.requestToken) + '" scrolling="no" allowfullscreen src="' + documentUrl + '" />')
+		const $iframe = $('<iframe data-cy="documentframe" id="richdocumentsframe" nonce="' + btoa(OC.requestToken) + '" scrolling="no" allowfullscreen allow="clipboard-read *; clipboard-write *" src="' + documentUrl + '" />')
 		odfViewer.loadingTimeout = setTimeout(odfViewer.onTimeout,
 			(OC.getCapabilities().richdocuments.config.timeout * 1000 || 15000))
 		$iframe.src = documentUrl