Glitch at Fidelity’s Web Site Exposed Accounts

A design flaw at a Fidelity Investments online service accessible to 300,000 people allowed Canadian account holders to view other customers’ account activity.

Fidelity said it had fixed the problem and was offering the 30 or so affected customers the option of changing account numbers.

Fidelity spokeswoman Kimberly Flood said the glitch did not affect U.S. customers, nor did it permit anyone to make unauthorized transactions.