Website Glitch Let Me Overstock My Coinbase

In 2014, Overstock.com became one of the first e-commerce vendors to accept bitcoin by partnering with Coinbase.  Earlier this month, Bancsec identified a flaw with Coinbase and Overstock.com that allowed customers to purchase items at a small fraction of the listed price.  Even worse, this flaw allowed customers paying with bitcoin to receive a refund much larger than what they had paid when the order was canceled.  Coinbase has since implemented a fix to resolve the issue.  

Relevant URL(s): https://krebsonsecurity.com/2018/01/website-glitch-let-me-overstock-my-coinbase/