Index: openacs-4/packages/xowiki/tcl/package-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/package-procs.tcl,v
diff -u -N -r1.332.2.3 -r1.332.2.4
--- openacs-4/packages/xowiki/tcl/package-procs.tcl	25 Mar 2019 19:15:00 -0000	1.332.2.3
+++ openacs-4/packages/xowiki/tcl/package-procs.tcl	1 Apr 2019 15:21:26 -0000	1.332.2.4
@@ -1002,6 +1002,10 @@
     set index_link [:make_link -privilege public -link "" ${:id} {} {}]
     set link [:query_parameter "return_url" ""]
     if {$link ne ""} {set back_link $link}
+    if {[util::external_url $link]} {
+      set link ""
+      unset back_link
+    }
     set top_includelets ""; set content $error_msg; set folderhtml ""
     ::xo::cc set status_code $status_code
     ::xo::Page requireCSS urn:ad:css:xowiki
Index: openacs-4/packages/xowiki/tcl/xowiki-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/xowiki-procs.tcl,v
diff -u -N -r1.542.2.7 -r1.542.2.8
--- openacs-4/packages/xowiki/tcl/xowiki-procs.tcl	29 Mar 2019 11:26:41 -0000	1.542.2.7
+++ openacs-4/packages/xowiki/tcl/xowiki-procs.tcl	1 Apr 2019 15:21:26 -0000	1.542.2.8
@@ -1266,6 +1266,20 @@
   Page instforward form_parameter {%set :package_id} %proc
   Page instforward exists_form_parameter {%set :package_id} %proc
 
+  Page insproc get_query_parameter_return_url {{default ""}} {
+    #
+    # Get the return_url from query parameters and check, if this is
+    # local.
+    #
+    set return_url [:query_parameter "return_url" $default]
+    if {[util::external_url $return_url]} {
+      ad_return_complaint 1 "Page <b>'${:name}'</b> non-local return_url was specified"
+      ad_script_abort
+    }
+    return $return_url
+  }
+
+
   #   Page instproc init {} {
   #     :log "--W "
   #     ::xo::show_stack
Index: openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl,v
diff -u -N -r1.368.2.7 -r1.368.2.8
--- openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl	31 Mar 2019 11:18:00 -0000	1.368.2.7
+++ openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl	1 Apr 2019 15:21:26 -0000	1.368.2.8
@@ -392,9 +392,7 @@
     }
     # do real deletion via package
     $package_id delete_revision -revision_id ${:revision_id} -item_id $item_id
-    # Take care about UI specific stuff....
-    set redirect [:query_parameter "return_url" \
-                      [export_vars -base [$package_id url] {{m revisions}}]]
+
     if {$live_revision == ${:revision_id}} {
       # latest revision might have changed by delete_revision, so we have to fetch here
       xo::dc 1row -prepare integer get_revision {select latest_revision from cr_items where item_id = :item_id}
@@ -665,7 +663,7 @@
     set fs_folder_id [:edit_set_file_selector_folder]
 
     if {[$package_id exists_query_parameter "return_url"]} {
-      set submit_link [:query_parameter "return_url" "."]
+      set submit_link [:get_query_parameter_return_url]
       set return_url $submit_link
     } else {
       #
@@ -946,7 +944,7 @@
 
       #array set __ia ${:instance_attributes}
       :load_values_into_form_fields $form_fields
-      
+
       foreach f $form_fields {set ff([$f name]) $f }
 
       #
@@ -1089,10 +1087,11 @@
       :render_form_action_buttons -CSSclass [string trim "$button_class(wym) $button_class(xinha)"]
     }
 
+
     if {$formNode ne ""} {
 
       if {[:exists_query_parameter "return_url"]} {
-        set return_url [:query_parameter "return_url"]
+        set return_url [:get_query_parameter_return_url]
       } else {
         #
         # When no return_url is specified and we edit a page different
@@ -1446,7 +1445,9 @@
     } else {
       set status_code 406
       foreach f $form_fields {
-        if {[$f error_msg] ne ""} {set error [::xo::localize [$f error_msg] 1]}
+        if {[$f error_msg] ne ""} {
+          set error [::xo::localize [$f error_msg] 1]
+        }
       }
     }
     ns_return $status_code text/html $error
@@ -2229,7 +2230,7 @@
           #ns_log notice "FORM_DATA var=$varname, value='$value' s=$s"
           #if {$varname eq "text"} {regsub -all "­" $value "" value}
           #ns_log notice "FORM_DATA var=$varname, value='$value'"
-          
+
           if {![string match "*.*" $att]} {
             set :$varname $value
           }
@@ -2537,7 +2538,7 @@
     }
   }
 
-  
+
   FormPage instproc load_values_into_form_fields {form_fields} {
     set is_new [:is_new_entry ${:name}]