Bootstrap v4.3.1 and v3.4.1 are out and available to patch an XSS vulnerability, CVE-2019-8331. For any users of the legacy 3.3.7, this will fix also other three XSS issues, namely CVE-2018-14040,  CVE-2018-14041 and CVE-2018-14042. Bootstrap now include a JavaScript sanitizer that will only allow whitelisted HTML elements in the data attribute of an element.

It’s available through all the channels: as NPM package, via CDNs and for old fashioned guys also as a direct download from Github. You do not have any excuses now, please upgrade!