3 files changed, 11 insertions, 3 deletions
diff --git a/actionpack/CHANGELOG b/actionpack/CHANGELOG
index f134fec599..98756c7582 100644
--- a/actionpack/CHANGELOG
+++ b/actionpack/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Fix HTML Sanitizer to allow trailing spaces in CSS style attributes.  Closes #10566 [wesley.moxam]
+
 * Add :default option to time_zone_select.  #10590 [Matt Aimonetti]
 
 
diff --git a/actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb b/actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb
index 1eb426aea1..12c8405101 100644
--- a/actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb
+++ b/actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb
@@ -107,7 +107,7 @@ module HTML
 
       # gauntlet
       if style !~ /^([:,;#%.\sa-zA-Z0-9!]|\w-\w|\'[\s\w]+\'|\"[\s\w]+\"|\([\d,\s]+\))*$/ ||
-          style !~ /^(\s*[-\w]+\s*:\s*[^:;]*(;|$))*$/
+          style !~ /^(\s*[-\w]+\s*:\s*[^:;]*(;|$)\s*)*$/
         return ''
       end
 
@@ -170,4 +170,4 @@ module HTML
       (value =~ /(^[^\/:]*):|(&#0*58)|(&#x70)|(%|&#37;)3A/ && !allowed_protocols.include?(value.split(protocol_separator).first))
     end
   end
-end
-\ No newline at end of file
+end
diff --git a/actionpack/test/controller/html-scanner/sanitizer_test.rb b/actionpack/test/controller/html-scanner/sanitizer_test.rb
index 8fe9bbc5e8..a9f4e88742 100644
--- a/actionpack/test/controller/html-scanner/sanitizer_test.rb
+++ b/actionpack/test/controller/html-scanner/sanitizer_test.rb
@@ -203,6 +203,12 @@ class SanitizerTest < Test::Unit::TestCase
     assert_equal expected, sanitize_css(raw)
   end
 
+  def test_should_sanitize_with_trailing_space
+	raw = "display:block; "
+	expected = "display: block;"
+	assert_equal expected, sanitize_css(raw)
+  end
+
   def test_should_sanitize_xul_style_attributes
     raw = %(-moz-binding:url('http://ha.ckers.org/xssmoz.xml#xss'))
     assert_equal '', sanitize_css(raw)
@@ -247,4 +253,4 @@ protected
   def sanitize_css(input)
     (@sanitizer ||= HTML::WhiteListSanitizer.new).sanitize_css(input)
   end
-end
-\ No newline at end of file
+end