There is a known XSS exploit in webmention.js 0.5.4 and earlier. If you are running webmention.js on your site, please update to the latest version!
Many thanks to @tyage for reporting this vulnerability (and @psmoros for facilitating the report, as well as running huntr.dev which looks like a great security research and reporting platform).
webmention.js now supports changing the sort criterion and order of responses, and defaults to publication (rather than receipt) time.
This was mostly to improve the presentation of responses received via brid.gy, particularly from Twitter.
Due to popular demand, there is now an NPM package for webmention.js. So, if you use npm as part of your site JavaScript workflow, now you can theoretically use this.
Thanks to André Jaenisch for his incredibly generous help in getting this set up!
And, if you run into any trouble (or have any suggestions for improvement), please open an issue.
(Full disclosure: I have even more of no idea what I’m doing than usual.)
So hey, if you’ve been using webmention.js you should probably update it, as there turned out to be an XSS issue found by Checkmention. Better to be safe than sorry etc. etc.