PayPal have said in a statement that "extensive forensic research" has shown "no evidence of unauthorized access or compromise to personal or financial information for PayPal customers."
eBay users asked to reset password as a precaution. PayPal account information has NOT been accessed or compromised. http://t.co/0MQhclFJly
They also stated that PayPal never shares financial information with merchants, "including eBay" and that it encourages any eBay user who used the same password on other sites to change those too.