Attackers are exploiting the “Envelopes: create API” of the enormously popular document-signing service to flood corporate inboxes with convincing phishing emails aimed at defrauding organizations. It’s an unusual attack vector with a high success rate.

​Attackers are exploiting the “Envelopes: create API” of the enormously popular document-signing service to flood corporate inboxes with convincing phishing emails aimed at defrauding organizations. It’s an unusual attack vector with a high success rate.