diff --git a/component.json b/component.json
index e4c782410b..9e8f3411ec 100755
--- a/component.json
+++ b/component.json
@@ -1,6 +1,6 @@
 {
   "name"        : "jquery",
-  "version"     : "1.4.4",
+  "version"     : "1.4.5-sec",
   "main"        : "./jquery.js",
   "dependencies": {
   }
diff --git a/jquery.js b/jquery.js
index a4f114586c..06026f8e47 100755
--- a/jquery.js
+++ b/jquery.js
@@ -1,5 +1,5 @@
 /*!
- * jQuery JavaScript Library v1.4.4
+ * jQuery JavaScript Library v1.4.5-sec
  * http://jquery.com/
  *
  * Copyright 2010, John Resig
@@ -11,7 +11,7 @@
  * Copyright 2010, The Dojo Foundation
  * Released under the MIT, BSD, and GPL Licenses.
  *
- * Date: Thu Nov 11 19:04:53 2010 -0500
+ * Date: Thu Feb 15 16:39:20 2024 -0600
  */
 (function( window, undefined ) {
 
@@ -35,8 +35,9 @@ var jQuery = function( selector, context ) {
 	rootjQuery,
 
 	// A simple way to check for HTML strings or ID strings
-	// (both of which we optimize for)
-	quickExpr = /^(?:[^<]*(<[\w\W]+>)[^>]*$|#([\w\-]+)$)/,
+	// Prioritize #id over <tag> to avoid XSS via location.hash (#9521)
+	// Strict HTML recognition (#11290: must start with <)
+	quickExpr = /^(?:(<[\w\W]+>)[^>]*|#([\w-]*))$/,
 
 	// Is it a simple selector
 	isSimple = /^.[^:#\[\.,]*$/,
@@ -211,7 +212,7 @@ jQuery.fn = jQuery.prototype = {
 	selector: "",
 
 	// The current version of jQuery being used
-	jquery: "1.4.4",
+	jquery: "1.4.5-sec",
 
 	// The default length of a jQuery object is 0
 	length: 0,
@@ -363,8 +364,9 @@ jQuery.extend = jQuery.fn.extend = function() {
 				src = target[ name ];
 				copy = options[ name ];
 
+				// Prevent Object.prototype pollution
 				// Prevent never-ending loop
-				if ( target === copy ) {
+				if ( name === "__proto__" || target === copy ) {
 					continue;
 				}
 
@@ -4623,7 +4625,6 @@ function winnow( elements, qualifier, keep ) {
 
 var rinlinejQuery = / jQuery\d+="(?:\d+|null)"/g,
 	rleadingWhitespace = /^\s+/,
-	rxhtmlTag = /<(?!area|br|col|embed|hr|img|input|link|meta|param)(([\w:]+)[^>]*)\/>/ig,
 	rtagName = /<([\w:]+)/,
 	rtbody = /<tbody/i,
 	rhtml = /<|&#?\w+;/,
@@ -4632,7 +4633,6 @@ var rinlinejQuery = / jQuery\d+="(?:\d+|null)"/g,
 	rchecked = /checked\s*(?:[^=]|=\s*.checked.)/i,
 	raction = /\=([^="'>\s]+\/)>/g,
 	wrapMap = {
-		option: [ 1, "<select multiple='multiple'>", "</select>" ],
 		legend: [ 1, "<fieldset>", "</fieldset>" ],
 		thead: [ 1, "<table>", "</table>" ],
 		tr: [ 2, "<table><tbody>", "</tbody></table>" ],
@@ -4642,7 +4642,6 @@ var rinlinejQuery = / jQuery\d+="(?:\d+|null)"/g,
 		_default: [ 0, "", "" ]
 	};
 
-wrapMap.optgroup = wrapMap.option;
 wrapMap.tbody = wrapMap.tfoot = wrapMap.colgroup = wrapMap.caption = wrapMap.thead;
 wrapMap.th = wrapMap.td;
 
@@ -4856,8 +4855,6 @@ jQuery.fn.extend({
 			(jQuery.support.leadingWhitespace || !rleadingWhitespace.test( value )) &&
 			!wrapMap[ (rtagName.exec( value ) || ["", ""])[1].toLowerCase() ] ) {
 
-			value = value.replace(rxhtmlTag, "<$1></$2>");
-
 			try {
 				for ( var i = 0, l = this.length; i < l; i++ ) {
 					// Remove element nodes and prevent memory leaks
@@ -5104,8 +5101,6 @@ jQuery.extend({
 				elem = context.createTextNode( elem );
 
 			} else if ( typeof elem === "string" ) {
-				// Fix "XHTML"-style tags in all browsers
-				elem = elem.replace(rxhtmlTag, "<$1></$2>");
 
 				// Trim whitespace, otherwise indexOf won't work as expected
 				var tag = (rtagName.exec( elem ) || ["", ""])[1].toLowerCase(),
@@ -5566,7 +5561,7 @@ if ( jQuery.expr && jQuery.expr.filters ) {
 
 
 var jsc = jQuery.now(),
-	rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
+	rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*< *\/ *script *>?/gi,
 	rselectTextarea = /^(?:select|textarea)/i,
 	rinput = /^(?:color|date|datetime|email|hidden|month|number|password|range|search|tel|text|time|url|week)$/i,
 	rnoContent = /^(?:GET|HEAD)$/,
@@ -6247,7 +6242,7 @@ jQuery.extend({
 				data = jQuery.parseJSON( data );
 
 			// If the type is "script", eval it in global context
-			} else if ( type === "script" || !type && ct.indexOf("javascript") >= 0 ) {
+			} else if ( type === "script" ) {
 				jQuery.globalEval( data );
 			}
 		}
diff --git a/src/ajax.js b/src/ajax.js
index d10b931129..9b9d2f4027 100644
--- a/src/ajax.js
+++ b/src/ajax.js
@@ -1,7 +1,7 @@
 (function( jQuery ) {
 
 var jsc = jQuery.now(),
-	rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
+	rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*< *\/ *script *>?/gi,
 	rselectTextarea = /^(?:select|textarea)/i,
 	rinput = /^(?:color|date|datetime|email|hidden|month|number|password|range|search|tel|text|time|url|week)$/i,
 	rnoContent = /^(?:GET|HEAD)$/,
@@ -682,7 +682,7 @@ jQuery.extend({
 				data = jQuery.parseJSON( data );
 
 			// If the type is "script", eval it in global context
-			} else if ( type === "script" || !type && ct.indexOf("javascript") >= 0 ) {
+			} else if ( type === "script" ) {
 				jQuery.globalEval( data );
 			}
 		}
diff --git a/src/core.js b/src/core.js
index 9e1bfc67fb..17af4bd804 100644
--- a/src/core.js
+++ b/src/core.js
@@ -16,8 +16,9 @@ var jQuery = function( selector, context ) {
 	rootjQuery,
 
 	// A simple way to check for HTML strings or ID strings
-	// (both of which we optimize for)
-	quickExpr = /^(?:[^<]*(<[\w\W]+>)[^>]*$|#([\w\-]+)$)/,
+	// Prioritize #id over <tag> to avoid XSS via location.hash (#9521)
+	// Strict HTML recognition (#11290: must start with <)
+	quickExpr = /^(?:(<[\w\W]+>)[^>]*|#([\w-]*))$/,
 
 	// Is it a simple selector
 	isSimple = /^.[^:#\[\.,]*$/,
@@ -344,8 +345,9 @@ jQuery.extend = jQuery.fn.extend = function() {
 				src = target[ name ];
 				copy = options[ name ];
 
+				// Prevent Object.prototype pollution
 				// Prevent never-ending loop
-				if ( target === copy ) {
+				if ( name === "__proto__" || target === copy ) {
 					continue;
 				}
 
diff --git a/src/manipulation.js b/src/manipulation.js
index d8fa020c85..dcc7a156f3 100644
--- a/src/manipulation.js
+++ b/src/manipulation.js
@@ -2,7 +2,6 @@
 
 var rinlinejQuery = / jQuery\d+="(?:\d+|null)"/g,
 	rleadingWhitespace = /^\s+/,
-	rxhtmlTag = /<(?!area|br|col|embed|hr|img|input|link|meta|param)(([\w:]+)[^>]*)\/>/ig,
 	rtagName = /<([\w:]+)/,
 	rtbody = /<tbody/i,
 	rhtml = /<|&#?\w+;/,
@@ -11,7 +10,6 @@ var rinlinejQuery = / jQuery\d+="(?:\d+|null)"/g,
 	rchecked = /checked\s*(?:[^=]|=\s*.checked.)/i,
 	raction = /\=([^="'>\s]+\/)>/g,
 	wrapMap = {
-		option: [ 1, "<select multiple='multiple'>", "</select>" ],
 		legend: [ 1, "<fieldset>", "</fieldset>" ],
 		thead: [ 1, "<table>", "</table>" ],
 		tr: [ 2, "<table><tbody>", "</tbody></table>" ],
@@ -21,7 +19,6 @@ var rinlinejQuery = / jQuery\d+="(?:\d+|null)"/g,
 		_default: [ 0, "", "" ]
 	};
 
-wrapMap.optgroup = wrapMap.option;
 wrapMap.tbody = wrapMap.tfoot = wrapMap.colgroup = wrapMap.caption = wrapMap.thead;
 wrapMap.th = wrapMap.td;
 
@@ -235,8 +232,6 @@ jQuery.fn.extend({
 			(jQuery.support.leadingWhitespace || !rleadingWhitespace.test( value )) &&
 			!wrapMap[ (rtagName.exec( value ) || ["", ""])[1].toLowerCase() ] ) {
 
-			value = value.replace(rxhtmlTag, "<$1></$2>");
-
 			try {
 				for ( var i = 0, l = this.length; i < l; i++ ) {
 					// Remove element nodes and prevent memory leaks
@@ -483,8 +478,6 @@ jQuery.extend({
 				elem = context.createTextNode( elem );
 
 			} else if ( typeof elem === "string" ) {
-				// Fix "XHTML"-style tags in all browsers
-				elem = elem.replace(rxhtmlTag, "<$1></$2>");
 
 				// Trim whitespace, otherwise indexOf won't work as expected
 				var tag = (rtagName.exec( elem ) || ["", ""])[1].toLowerCase(),
diff --git a/test/unit/ajax.js b/test/unit/ajax.js
index 4ce14c24cf..3c99c41dc1 100644
--- a/test/unit/ajax.js
+++ b/test/unit/ajax.js
@@ -989,8 +989,8 @@ test("jQuery.ajax() - malformed JSON", function() {
 	});
 });
 
-test("jQuery.ajax() - script by content-type", function() {
-	expect(1);
+test("jQuery.ajax() - do not execute script by content-type if dataType is not script", function() {
+	expect(0);
 
 	stop();
 
@@ -1003,6 +1003,21 @@ test("jQuery.ajax() - script by content-type", function() {
 	});
 });
 
+test("jQuery.ajax() - execute script by content-type if dataType is script", function() {
+	expect(1);
+
+	stop();
+
+	jQuery.ajax({
+		url: "data/script.php",
+		data: { header: "script" },
+		success: function() {
+	  		start();
+		},
+		dataType: 'script'
+	});
+});
+
 test("jQuery.ajax() - json by content-type", function() {
 	expect(5);
 
diff --git a/test/unit/core.js b/test/unit/core.js
index 7ef2ad7e2a..c4d96ab009 100644
--- a/test/unit/core.js
+++ b/test/unit/core.js
@@ -55,7 +55,7 @@ test("jQuery()", function() {
 	var img = jQuery("<img/>");
 	equals( img.length, 1, "Correct number of elements generated for img" );
 	equals( img.parent().length, 0, "Make sure that the generated HTML has no parent." );
-	var div = jQuery("<div/><hr/><code/><b/>");
+	var div = jQuery("<div></div><hr><code></code><b></b>");
 	equals( div.length, 4, "Correct number of elements generated for div hr code b" );
 	equals( div.parent().length, 0, "Make sure that the generated HTML has no parent." );
 
@@ -499,6 +499,36 @@ test("jQuery('html', context)", function() {
 	equals($span.length, 1, "Verify a span created with a div context works, #1763");
 });
 
+test("XSS via location.hash", function() {
+	expect(1);
+
+	stop();
+	jQuery._check9521 = function(x){
+		ok( x, "script called from #id-like selector with inline handler" );
+		jQuery("#check9521").remove();
+		delete jQuery._check9521;
+	};
+
+	var $eCheck9521 = jQuery( '#<img id="check9521" src="no-such-.gif" onerror="jQuery._check9521(false)"' );
+
+	if($eCheck9521.length) {
+		$eCheck9521.appendTo("#main");
+	}
+	else {
+		jQuery._check9521(true);
+	}
+
+	start();
+
+});
+
+test( "jQuery.extend( true, ... ) Object.prototype pollution", function( assert ) {
+	expect( 1 );
+
+	jQuery.extend( true, {}, JSON.parse( "{\"__proto__\": {\"devMode\": true}}" ) );
+	ok( !( "devMode" in {} ), "Object.prototype not polluted" );
+} );
+
 if ( !isLocal ) {
 test("jQuery(selector, xml).text(str) - Loaded via XML document", function() {
 	expect(2);
diff --git a/test/unit/css.js b/test/unit/css.js
index cddd90256e..24c3fdcb81 100644
--- a/test/unit/css.js
+++ b/test/unit/css.js
@@ -23,7 +23,7 @@ test("css(String|Hash)", function() {
 	equals( div.css("width"), "4px", "Width on disconnected node." );
 	equals( div.css("height"), "4px", "Height on disconnected node." );
 
-	var div2 = jQuery( "<div style='display:none;'><input type='text' style='height:20px;'/><textarea style='height:20px;'/><div style='height:20px;'></div></div>").appendTo("body");
+	var div2 = jQuery( "<div style='display:none;'><input type='text' style='height:20px;'/><textarea style='height:20px;'></textarea><div style='height:20px;'></div></div>").appendTo("body");
 
 	equals( div2.find("input").css("height"), "20px", "Height on hidden input." );
 	equals( div2.find("textarea").css("height"), "20px", "Height on hidden textarea." );
diff --git a/test/unit/manipulation.js b/test/unit/manipulation.js
index d4c4348719..d86cf035fd 100644
--- a/test/unit/manipulation.js
+++ b/test/unit/manipulation.js
@@ -904,7 +904,7 @@ var testHtml = function(valueObj) {
 	}
 	ok( pass, "Set HTML" );
 
-	div = jQuery("<div/>").html( valueObj('<div id="parent_1"><div id="child_1"/></div><div id="parent_2"/>') );
+	div = jQuery("<div>").html( valueObj("<div id='parent_1'><div id='child_1'></div></div><div id='parent_2'></div>") );
 
 	equals( div.children().length, 2, "Make sure two child nodes exist." );
 	equals( div.children().children().length, 1, "Make sure that a grandchild exists." );
diff --git a/version.txt b/version.txt
index e1df5de7ae..0cc3d278ce 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-1.4.4
\ No newline at end of file
+1.4.5-sec