Millions of people share their bank account passwords with third-party sites and apps that help them track their spending, but some of the biggest financial institutions, wary of hacking risks, are trying to scare people into not using them.

JPMorgan Chase & Co. and Capital One Financial Corp., for example, warn on their websites that customers could be liable for any fraud in their accounts -- even though federal regulations say otherwise.

Capital One's site tells users: "If you choose to share account access information with a third-party, Capital One is not liable for any resulting damages or losses."

Chase admonishes, "If you give out your chase.com user ID and password, you are putting your money at risk."

The warnings were enough to cause Morris Armstrong, a registered investment advisor and enrolled agent in Danbury, Connecticut, to recently close his account with Mint.com, a so-called aggregator website and a division of Intuit Inc.

"People are hacking left and right. You don't want to make it easier," Armstrong said.

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