British Airways' air-miles accounts, the coding site GitHub and the work chat service Slack have all been hit in the latest wave of cyber-attacks.
The firms have all notified their users of the incidents, which varied in approach and do not appear to be connected.
In addition, several Uber users have complained of their accounts being hacked.
However, the car pick-up service said it had "found no evidence of a breach".
The firms have dealt with the attacks in different ways, and BA has been criticised for how it responded.
Complaints about points being stolen from the BA's Executive Club scheme date back at least a fortnight.
One user said their account had been used by someone else to book a hotel room in Spain, while others reported that their list of transactions showed "ex-gratia" deductions that had wiped out their entire credit.
GitHub DDoS attack
The attack on San Francisco-based GitHub - which is used by more than 8 million software developers - has involved an attempt to knock its site offline by flooding it with traffic.
"We are currently experiencing the largest DDoS (distributed denial of service) attack in GitHub's history,"
Slack reported it was attacked in February.
The US firm provides a way for team members to communicate with each other as an alternative to email.
The service is less than two years old, but was recently valued at being worth $2.8bn (£1.9bn). Were businesses to believe the data it held was insecure then its future would be threatened.Slack said it believed the hackers had accessed a database that would have allowed them to see user names, email addresses and Skype IDs.
However, it added that passwords - which give users access to posted information - were encrypted in a form that made it "computationally infeasible" for the hackers to unscramble them.
Cited at BBC News
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