diff --git a/CHANGELOG b/CHANGELOG
index 583bd3a7b..2397f03af 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -69,6 +69,7 @@ CHANGELOG Roundcube Webmail
 - Fix bug where Next/Prev button in mail view didn't work with multi-folder search result (#6793)
 - Fix bug where selection of columns on messages list wasn't working
 - Fix bug in converting multi-page Tiff images to Jpeg (#6824)
+- Fix bug where handling multiple messages from multi-folder search result could not work (#6845)
 
 RELEASE 1.4-rc1
 ---------------
diff --git a/plugins/markasjunk/markasjunk.js b/plugins/markasjunk/markasjunk.js
index 378bb305f..c00907bb3 100644
--- a/plugins/markasjunk/markasjunk.js
+++ b/plugins/markasjunk/markasjunk.js
@@ -26,10 +26,10 @@ rcube_webmail.prototype.markasjunk_mark = function(is_spam) {
 }
 
 rcube_webmail.prototype.rcmail_markasjunk_move = function(mbox, uids) {
-    var prev_uid = this.env.uid, a_uids = $.isArray(uids) ? uids : uids.split(",");
+    var prev_uid = this.env.uid;
 
-    if (this.message_list && a_uids.length == 1 && !this.message_list.in_selection([a_uids[0]]))
-        this.env.uid = a_uids[0];
+    if (this.message_list && uids.length == 1 && !this.message_list.in_selection(uids[0]))
+        this.env.uid = uids[0];
 
     if (mbox)
         this.move_messages(mbox);
diff --git a/program/js/app.js b/program/js/app.js
index d1cbbf45c..f5f506129 100644
--- a/program/js/app.js
+++ b/program/js/app.js
@@ -3391,7 +3391,7 @@ function rcube_webmail()
   this.toggle_read_status = function(flag, a_uids)
   {
     var i, len = a_uids.length,
-      post_data = this.selection_post_data({_uid: this.uids_to_list(a_uids), _flag: flag}),
+      post_data = this.selection_post_data({_uid: a_uids, _flag: flag}),
       lock = this.display_message('markingmessage', 'loading');
 
     // mark all message rows as read/unread
@@ -3406,7 +3406,7 @@ function rcube_webmail()
   {
     var i, len = a_uids.length,
       win = this.env.contentframe ? this.get_frame_window(this.env.contentframe) : window,
-      post_data = this.selection_post_data({_uid: this.uids_to_list(a_uids), _flag: flag}),
+      post_data = this.selection_post_data({_uid: a_uids, _flag: flag}),
       lock = this.display_message('markingmessage', 'loading');
 
     // mark all message rows as flagged/unflagged
@@ -3454,7 +3454,7 @@ function rcube_webmail()
   this.flag_as_undeleted = function(a_uids)
   {
     var i, len = a_uids.length,
-      post_data = this.selection_post_data({_uid: this.uids_to_list(a_uids), _flag: 'undelete'}),
+      post_data = this.selection_post_data({_uid: a_uids, _flag: 'undelete'}),
       lock = this.display_message('markingmessage', 'loading');
 
     for (i=0; i<len; i++)
@@ -3466,7 +3466,7 @@ function rcube_webmail()
   this.flag_as_deleted = function(a_uids)
   {
     var r_uids = [],
-      post_data = this.selection_post_data({_uid: this.uids_to_list(a_uids), _flag: 'delete'}),
+      post_data = this.selection_post_data({_uid: a_uids, _flag: 'delete'}),
       lock = this.display_message('markingmessage', 'loading'),
       list = this.message_list,
       rows = list ? list.rows : {},
@@ -3530,7 +3530,14 @@ function rcube_webmail()
   // with select_all mode checking
   this.uids_to_list = function(uids)
   {
-    return this.select_all_mode ? '*' : ($.isArray(uids) ? uids.join(',') : uids);
+    if (this.select_all_mode)
+      return '*';
+
+    // multi-folder list of uids cannot be passed as a string (#6845)
+    if ($.isArray(uids) && (uids.length == 1 || String(uids[0]).indexOf('-') == -1))
+      uids = uids.join(',');
+
+    return uids;
   };
 
   // Sets title of the delete button
diff --git a/program/steps/mail/func.inc b/program/steps/mail/func.inc
index 1dec50253..60fd84146 100644
--- a/program/steps/mail/func.inc
+++ b/program/steps/mail/func.inc
@@ -36,18 +36,18 @@ if (!empty($_REQUEST['_search']) && isset($_SESSION['search'])
 
 // remove mbox part from _uid
 if (($_uid  = rcube_utils::get_input_value('_uid', rcube_utils::INPUT_GPC)) && !is_array($_uid) && preg_match('/^\d+-.+/', $_uid)) {
-  list($_uid, $mbox) = explode('-', $_uid, 2);
-  if (isset($_GET['_uid']))  $_GET['_uid']  = $_uid;
-  if (isset($_POST['_uid'])) $_POST['_uid'] = $_uid;
-  $_REQUEST['_uid'] = $_uid;
-  unset($_uid);
-
-  // override mbox
-  if (!empty($mbox)) {
-    $_GET['_mbox']  = $mbox;
-    $_POST['_mbox'] = $mbox;
-    $RCMAIL->storage->set_folder(($_SESSION['mbox'] = $mbox));
-  }
+    list($_uid, $mbox) = explode('-', $_uid, 2);
+    if (isset($_GET['_uid']))  $_GET['_uid']  = $_uid;
+    if (isset($_POST['_uid'])) $_POST['_uid'] = $_uid;
+    $_REQUEST['_uid'] = $_uid;
+    unset($_uid);
+
+    // override mbox
+    if (!empty($mbox)) {
+        $_GET['_mbox']  = $mbox;
+        $_POST['_mbox'] = $mbox;
+        $RCMAIL->storage->set_folder($_SESSION['mbox'] = $mbox);
+    }
 }
 
 if (!empty($_SESSION['browser_caps']) && !$OUTPUT->ajax_call) {