diff --git a/changelog.md b/changelog.md
index c8acb1c4..39d9b646 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,8 @@
 # RubySaml Changelog
 
+### 1.12.3 (Sep 10, 2024)
+* Fix for critical vulnerability CVE-2024-45409: SAML authentication bypass via Incorrect XPath selector
+
 ### 1.12.2 (Apr 08, 2022)
 * [575](https://github.com/onelogin/ruby-saml/pull/575) Fix SloLogoutresponse bug on LogoutRequest
 
diff --git a/lib/onelogin/ruby-saml/version.rb b/lib/onelogin/ruby-saml/version.rb
index 3416b240..2c4f603a 100644
--- a/lib/onelogin/ruby-saml/version.rb
+++ b/lib/onelogin/ruby-saml/version.rb
@@ -1,5 +1,5 @@
 module OneLogin
   module RubySaml
-    VERSION = '1.12.2'
+    VERSION = '1.12.3'
   end
 end
diff --git a/lib/xml_security.rb b/lib/xml_security.rb
index 86b89ac3..652b8ae6 100644
--- a/lib/xml_security.rb
+++ b/lib/xml_security.rb
@@ -312,17 +312,30 @@ def validate_signature(base64_cert, soft = true)
       canon_string = noko_signed_info_element.canonicalize(canon_algorithm)
       noko_sig_element.remove
 
+      # get signed info
+      signed_info_element = REXML::XPath.first(
+        sig_element,
+        "./ds:SignedInfo",
+        { "ds" => DSIG }
+      )
+
       # get inclusive namespaces
       inclusive_namespaces = extract_inclusive_namespaces
 
       # check digests
-      ref = REXML::XPath.first(sig_element, "//ds:Reference", {"ds"=>DSIG})
+      ref = REXML::XPath.first(signed_info_element, "./ds:Reference", {"ds"=>DSIG})
 
-      hashed_element = document.at_xpath("//*[@ID=$id]", nil, { 'id' => extract_signed_element_id })
+      reference_nodes = document.xpath("//*[@ID=$id]", nil, { 'id' => extract_signed_element_id })
+
+      if reference_nodes.length > 1 # ensures no elements with same ID to prevent signature wrapping attack.
+        return append_error("Duplicated IDs found", soft)
+      end
+
+      hashed_element = reference_nodes[0]
 
       canon_algorithm = canon_algorithm REXML::XPath.first(
-        ref,
-        '//ds:CanonicalizationMethod',
+        signed_info_element,
+        './ds:CanonicalizationMethod',
         { "ds" => DSIG }
       )
 
@@ -332,13 +345,13 @@ def validate_signature(base64_cert, soft = true)
 
       digest_algorithm = algorithm(REXML::XPath.first(
         ref,
-        "//ds:DigestMethod",
+        "./ds:DigestMethod",
         { "ds" => DSIG }
       ))
       hash = digest_algorithm.digest(canon_hashed_element)
       encoded_digest_value = REXML::XPath.first(
         ref,
-        "//ds:DigestValue",
+        "./ds:DigestValue",
         { "ds" => DSIG }
       )
       digest_value = Base64.decode64(OneLogin::RubySaml::Utils.element_text(encoded_digest_value))
@@ -364,7 +377,7 @@ def validate_signature(base64_cert, soft = true)
     def process_transforms(ref, canon_algorithm)
       transforms = REXML::XPath.match(
         ref,
-        "//ds:Transforms/ds:Transform",
+        "./ds:Transforms/ds:Transform",
         { "ds" => DSIG }
       )