No. Putting aside the subject of allowing some tags (not really the point of the question), HtmlEncode simply does NOT cover all XSS attacks. For instance, consider server-generated client-side javascript – the server dynamically outputs htmlencoded values directly into the client-side javascript, htmlencode will not stop injected script from executing. Next, consider the following pseudocode: … Read more
With the standard library: HTML Escape try: from html import escape # python 3.x except ImportError: from cgi import escape # python 2.x print(escape(“<“)) HTML Unescape try: from html import unescape # python 3.4+ except ImportError: try: from html.parser import HTMLParser # python 3.x (<3.4) except ImportError: from HTMLParser import HTMLParser # python 2.x unescape … Read more
If you’re inserting text content in your document in a location where text content is expected1, you typically only need to escape the same characters as you would in XML. Inside of an element, this just includes the entity escape ampersand & and the element delimiter less-than and greater-than signs < >: & becomes & < … Read more
There is a problem with your solution code–it will only escape the first occurrence of each special character. For example: escapeHtml(‘Kip\’s <b>evil</b> “test” code\’s here’); Actual: Kip's <b>evil</b> "test” code’s here Expected: Kip's <b>evil</b> "test" code's here Here is code that works properly: function escapeHtml(text) { return text .replace(/&/g, “&”) .replace(/</g, “<”) .replace(/>/g, “>”) .replace(/”/g, … Read more
A potentially dangerous Request.Form value was detected from the client