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Moderate severityNVD Advisory· Published Aug 29, 2011· Updated Apr 29, 2026

CVE-2011-2932

CVE-2011-2932

Description

Cross-site scripting (XSS) vulnerability in activesupport/lib/active_support/core_ext/string/output_safety.rb in Ruby on Rails 2.x before 2.3.13, 3.0.x before 3.0.10, and 3.1.x before 3.1.0.rc5 allows remote attackers to inject arbitrary web script or HTML via a malformed Unicode string, related to a "UTF-8 escaping vulnerability."

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
activesupportRubyGems
>= 2.0.0, < 2.3.132.3.13
activesupportRubyGems
>= 3.0.0, < 3.0.103.0.10

Affected products

60
  • Rubyonrails/Rails58 versions
    cpe:2.3:a:rubyonrails:rails:2.0.0:*:*:*:*:*:*:*+ 57 more
    • cpe:2.3:a:rubyonrails:rails:2.0.0:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.0.0:rc1:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.0.0:rc2:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.0.1:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.0.2:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.0.4:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.1.0:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.1.1:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.1.2:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.2.0:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.2.1:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.2.2:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.3.10:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.3.11:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.3.12:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.3.2:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.3.3:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.3.4:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:2.3.9:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.0:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.0:beta:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.0:beta2:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.0:beta3:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.0:beta4:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.0:rc:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.0:rc2:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.1:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.10:rc1:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.1:pre:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.2:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.2:pre:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.3:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.4:rc1:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.5:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.5:rc1:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.6:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.6:rc1:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.6:rc2:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.7:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.7:rc1:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.7:rc2:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.8:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.8:rc1:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.8:rc2:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.8:rc3:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.8:rc4:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.9:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.9:rc1:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.9:rc2:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.9:rc3:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.9:rc4:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.0.9:rc5:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.1.0:*:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.1.0:beta1:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.1.0:rc1:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.1.0:rc2:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.1.0:rc3:*:*:*:*:*:*
    • cpe:2.3:a:rubyonrails:rails:3.1.0:rc4:*:*:*:*:*:*
  • Rubyonrails/Ruby On Rails
    cpe:2.3:a:rubyonrails:ruby_on_rails:3.0.4:*:*:*:*:*:*:*
  • ghsa-coords
    pkg:gem/activesupport
    Range: >= 2.0.0, < 2.3.13

Patches

1
bfc432574d0b

properly escape html to avoid invalid utf8 causing XSS attacks

https://github.com/rails/railsAaron PattersonAug 16, 2011via ghsa
commit
2 files changed · +8 −1
  • activesupport/lib/active_support/core_ext/string/output_safety.rb+1 −1 modified
    @@ -20,7 +20,7 @@ def html_escape(s)
       if s.html_safe?
         s
       else
-        s.gsub(/[&"><]/) { |special| HTML_ESCAPE[special] }.html_safe
+        s.to_s.gsub(/&/, "&amp;").gsub(/\"/, "&quot;").gsub(/>/, "&gt;").gsub(/</, "&lt;").html_safe
       end
     end
  • activesupport/test/core_ext/string_ext_test.rb+7 −0 modified
    @@ -7,10 +7,17 @@
 require 'active_support/core_ext/string'
 require 'active_support/time'
 require 'active_support/core_ext/string/strip'
+require 'active_support/core_ext/string/output_safety'
 
 class StringInflectionsTest < Test::Unit::TestCase
   include InflectorTestCases
 
+  def test_erb_escape
+    string = [192, 60].pack('CC')
+    expected = 192.chr + "&lt;"
+    assert_equal expected, ERB::Util.html_escape(string)
+  end
+
   def test_strip_heredoc_on_an_empty_string
     assert_equal '', ''.strip_heredoc
   end

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

17

News mentions

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