![]() Verifiers SHOULD permit claimants to use “paste” functionality when entering a memorized secret. The National Institute of Standards and Technology (NIST) Special Publication 800-63B 2, which lays out identity guidelines for the U.S. While I could not find any guidance suggesting that disabling paste led to more secure websites, I did find guidance suggesting that paste be allowed. But does disabling paste actually improve security in some way? Disabling paste on textboxes effectively eliminates one of the key benefits of password managers. All of these are important to get correct, and I wouldn’t trust myself to type them in repeatedly without making an error. Personally, I also use my password manager to store other important pieces of information that I might need online such as credit card numbers, driver’s license number, etc. You look up the value that you want, copy it to the clipboard, and paste it in. ![]() Of course, password management software is designed for pasting values. Therefore, it’s safe to assume that no legitimate user would need to paste a value into a textbox. People pasting sensitive values into a textbox are clearly copying from a big list of data trying to access someone else’s account. The theory is simple: Legitimate users don’t paste values into textboxes. This is a good place to start understanding the paranoia that leads to disabling paste on single textboxes. It happens so frequently that there is a website 1 that checks these data dumps to see if your email address is associated with any of the breaches. The result is a massive text file with usernames, passwords, and other sensitive information tied directly to email addresses. It seems like every week we hear about a major security breach at a company that stores millions of usernames and passwords. These two patterns seem to indicate two different reasons for blocking paste: fear of attacks and fear of incorrect information. This is a confirmation flow, where you are asked, for example, to enter your email address and then to confirm your email address in the second textbox. Paste is blocked on a second textbox only.This tends to happen with passwords, account numbers, and personal identification numbers when there is just one textbox to fill in with this information. How websites block paste is also interesting because there seem to be two specific patterns: That gives a hint that part of the reason for disabling paste concerns security in some way. Personal identification numbers (Social Security number, driver’s license number, etc.)Īside from email addresses, the other three are sensitive data that you wouldn’t want to accidentally share with people.Looking across my recent browsing history, I’ve found instances where paste was blocked when entering any of the following pieces of data: (Some less experienced developers may try to block the keyboard shortcuts directly, but that still allows paste using the context menu.) What types of fields disallow paste? In either case, the paste operation is blocked both from keyboard shortcuts (like Ctrl+V or Cmd+V) and from context menus. addEventListener ( "paste", event => event. Or you can disable paste inside of JavaScript code by canceling the default behavior of the paste event, like this: textbox. You can use the onpaste attribute in the HTML of the textbox, like this: How do websites disallow paste?ĭisallowing paste in a website textbox is a straightforward process using JavaScript. I found myself wondering why, in 2023, so many sites are still blocking paste in places where people are more likely to (and arguably should be) pasting values. A flurry of expletives dripped from my mouth. The form disallowed pasting into the box. When I went to paste my account number into that box, it didn’t work. Then there was a third field: confirm account number. To do so, I was asked to input the routing number and account number for my account, which I did by pasting those values from my password manager (where I store all sensitive information). I recently needed to make an online payment using my checking account. HTML, Security, Accessibility, Forms, JavaScript
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