diff --git a/docs/changelog/5.x.x.txt b/docs/changelog/5.x.x.txt
index d660c3379..5bf47e90d 100644
--- a/docs/changelog/5.x.x.txt
+++ b/docs/changelog/5.x.x.txt
@@ -29,6 +29,8 @@
  - Fixed bug [ 808704 ] Privilege API missing in Ruling WebGUI 5.4
  - Updated the Norwegian translation. (Thanks to Nils-Magne Kvammen.)
  - Updated the German translation. (Thanks to Andreas Graf.)
+ - Fixed a security problem where users could access a forum they didn't have
+   privileges to view if they created a specific URL.
 
 
 5.5.0
diff --git a/lib/WebGUI/Forum/UI.pm b/lib/WebGUI/Forum/UI.pm
index ee9ee002d..df072b6eb 100644
--- a/lib/WebGUI/Forum/UI.pm
+++ b/lib/WebGUI/Forum/UI.pm
@@ -969,40 +969,47 @@ sub forumPropertiesSave {
 
 #-------------------------------------------------------------------
 
-=head2 forumOp ( callback, title, description )
+=head2 forumOp ( caller )
 
 Returns the output of the various www_ subroutines.
 
 =over
 
-=item callback
+=item caller
 
-The URL to get back to the calling object.
+A hash reference containing information passed from the calling object. The following are hash keys that should be passed:
 
-=item title
+callback: The URL to get back to the calling object.
 
-The title of the parent object for display in the forum templates.
+title: The title of the parent object for display in the forum templates.
 
-=item description
+description: The description of the parent object for display in the fourm templates.
 
-The description of the parent object for display in the fourm templates.
+forumId: The ID of the forum that is attached to the calling object.
 
 =back
 
 =cut
 
 sub forumOp {
-        my ($callback, $title, $description) = @_;
-	my $caller = {
-		callback=>$callback,
-		title=>$title,
-		description=>$description
-		};
+        my ($caller) = @_;
 	if ($session{form}{forumOp} =~ /^[A-Za-z]+$/) {
+		my $forumId = $session{form}{forumId};
+		if ($session{form}{forumPostId}) {
+			my $post = WebGUI::Forum::Post->new($session{form}{forumPostId});
+			$forumId = $post->getThread->get("forumId");
+		} elsif ($session{form}{forumThreadId}) {
+			my $thread = WebGUI::Forum::Thread->new($session{form}{forumThreadId});
+			$forumId = $thread->get("forumId");
+		}
+		if ($forumId != $caller->{forumId}) {
+			WebGUI::ErrorHandler::security("view a forum (".$caller->{forumId}.") that does not belong to the calling object (".$caller->{callback}.")");
+			return WebGUI::Privilege::insufficient();
+		} 
         	my $cmd = "www_".$session{form}{forumOp};
         	return &$cmd($caller);
 	} else {
-		WebGUI::ErrorHandler::security("execute an invalid forum operation: ".$session{form}{forumOp});
+		return WebGUI::ErrorHandler::security("execute an invalid forum operation: ".$session{form}{forumOp});
 	}
 }
 
diff --git a/lib/WebGUI/Wobject/Article.pm b/lib/WebGUI/Wobject/Article.pm
index aa38d1653..0caab493e 100644
--- a/lib/WebGUI/Wobject/Article.pm
+++ b/lib/WebGUI/Wobject/Article.pm
@@ -193,7 +193,16 @@ sub www_view {
                 $templateId = $_[0]->get("templateId");
         }
 	if ($session{form}{forumOp}) {
-		return WebGUI::Forum::UI::forumOp($callback,$_[0]->get("title"),$_[0]->get("description"));
+		unless ($!= $_[0]->get("wobjectId")) {
+                        WebGUI::ErrorHandler::security("access a forum that was not related to this message board (".$_[0]->get("wobjectId").")");
+                        return WebGUI::Privilege::insufficient();
+                }
+		return WebGUI::Forum::UI::forumOp({
+			callback=>$callback,
+			title=>$_[0]->get("title"),
+			description=>$_[0]->get("description"),
+			forumId=>$_[0]->get("forumId")
+			});
 	} else {
 		return $_[0]->processTemplate($templateId,\%var);
 	}
diff --git a/lib/WebGUI/Wobject/MessageBoard.pm b/lib/WebGUI/Wobject/MessageBoard.pm
index 131993354..4ee994cf0 100644
--- a/lib/WebGUI/Wobject/MessageBoard.pm
+++ b/lib/WebGUI/Wobject/MessageBoard.pm
@@ -166,13 +166,16 @@ sub www_moveForumUp {
 sub www_view {
 	my $callback = WebGUI::URL::page("func=view&wid=".$_[0]->get("wobjectId"));
 	if ($session{form}{forumOp}) {
-		my ($title, $description);
-		if ($session{form}{forumId} ne "") {
-			($title,$description) = WebGUI::SQL->quickArray("select title,description from MessageBoard_forums where forumId=".$session{form}{forumId});
-			my $forumParam = "forumId=".$session{form}{forumId};
-			$callback = WebGUI::URL::append($callback,$forumParam);
-		}
-		return WebGUI::Forum::UI::forumOp($callback,$title,$description);
+		my ($forumId, $title, $description) = WebGUI::SQL->quickArray("select forumId, title, description from MessageBoard_forums 
+			where wobjectId=".$_[0]->get("wobjectId")." and forumId=".$session{form}{forumId});
+		my $forumParam = "forumId=".$forumId;
+		$callback = WebGUI::URL::append($callback,$forumParam);
+		return WebGUI::Forum::UI::forumOp({
+			callback=>$callback,
+			title=>$title,
+			description=>$description,
+			forumId=>$forumId
+			});
 	}
 	my %var;
 	$var{title} = $_[0]->get("title");
diff --git a/lib/WebGUI/Wobject/USS.pm b/lib/WebGUI/Wobject/USS.pm
index d01a724c4..f4fca1252 100644
--- a/lib/WebGUI/Wobject/USS.pm
+++ b/lib/WebGUI/Wobject/USS.pm
@@ -545,7 +545,11 @@ sub www_viewSubmission {
 	return $_[0]->www_view unless ($submission->{USS_submissionId});
 	my $callback = WebGUI::URL::page("func=viewSubmission&wid=".$_[0]->get("wobjectId")."&sid=".$submission->{USS_submissionId});
 	if ($session{form}{forumOp}) {	
-		return WebGUI::Forum::UI::forumOp($callback,$submission->{title});
+		return WebGUI::Forum::UI::forumOp({
+			callback=>$callback,
+			title=>$submission->{title},
+			forumId=>$submission->{forumId}
+			});
 	}
 	WebGUI::SQL->write("update USS_submission set views=views+1 where USS_submissionId=$session{form}{sid}");
 	$var{title} = $submission->{title};