Notifying users of revoked Let's Encrypt certificates
The team at Let's Encrypt, the free certificate authority, has identified an issue that might have lead to unauthorized certificate issuance. Because it's hard to determine which sites have been abused, they have no other choice but to revoke all certificates that may have been maliciously issued. The result is a massive 3,048,289 certificates that will be revoked within the next 24 hours. We've just finished alerting all our users that are affected by this.