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Having more accounts and more passwords probably increases the chances that someone could hack into at least one account.
But even if someone did hack into my Mint account, would there be any reason to worry?
What about other risks with mint.com? And what if I use Bank of America in particular?
Mint.com uses something called OFX (Open Financial Exchange) to get the information in your bank account. If someone accessed your mint account they would not be able to perform any transactions with your bank. All they would be able to do is view the same information you do, which some of it could be personal <- that's up to you.
Generally the weakest point in security is with the user. An "attacker" is far more likely to get your account information from you then he is from the site your registered with.
Why you're the weakest point:
When you enter your account information, your password is never saved exactly how you enter it. It's passed through what is called a "one way function", these functions are easy to compute one way but given the end-result is EXTREMELY difficult to compute in reverse. So in a database if someone looked up your password they would see it something like this "31435008693ce6976f45dedc5532e2c1". When you log in to an account your password is sent through this function and then the result is checked against what is saved in the database, if they match you are granted access. The way an attacker would go about getting your password is by entering values into the function and checking the values against yours, this is known as a brute force attack. For our example (31435008693ce6976f45dedc5532e2c1) it would take someone 5 million years to decry-pt using a basic brute force attack. I used "thisismypassword" as my example password, it's 12 characters long. This is why most sites urge you to create long passwords with a mix of numbers, uppercase, lowercase and symbols.
This is a very basic explanation of security and both sides have better tools then the one explained but this gives you an idea of how security works for sites like these.
You're far more likely to get a virus or a key logger steal your information.
I do use Mint.
Edit:
From the Mint FAQ:
Do you store my bank login information on your servers?
Your bank login credentials are stored securely in a separate database using multi-layered hardware and software encryption. We only store the information needed to save you the trouble of updating, syncing or uploading financial information manually.
Edit 2: From OFX
Open Financial Exchange (OFX) is a unified specification for the electronic exchange of financial data between financial institutions, businesses and consumers via the Internet.
This is how mint is able to communicate with even your small local bank.
FINAL EDIT: ( This answers everything )
For passwords to Mint itself, we compute a secure hash of the user's chosen password and store only the hash (the hash is also salted - see http://en.wikipedia.org/wiki/Sal... ). Hashing is a one-way function and cannot be reversed. It is not possible to ever see or recover the password itself. When the user tries to login, we compute the hash of the password they are attempting to use and compare it to the hashed value on record. (This is a standard technique which every site should use).
For banking credentials, we generally must use reversible encryption for which we have special procedures and secure hardware kept in our secure and guarded datacenter. The decryption keys never leave the hardware device (which is built to destroy the key material if the tamper protection is attacked). This device will only decrypt after it is activated by a quorum of other keys, each of which is stored on a smartcard and also encrypted by a password known to only one person. Furthermore the device requires a time-limited cryptographically-signed permission token for each decryption. The system (which I designed and patented) also has facilities for secure remote auditing of each decryption.
Source: David K Michaels, VP Engineering, Mint.com - http://www.quora.com/How-do-mint-com-and-similar-websites-avoid-storing-passwords-in-plain-text
Some banks allow mint.com read-only access via a separate "access code" that a customer can create. This would still allow an attacker to find out how much money you have and transaction details, and may have knowledge of some other information (your account number perhaps, your address, etc).
The problem with even this read-only access is that many banks also allow users at other banks to set up a direct debit authorization which allows withdrawals. And to set the direct debit link up, the main hurdle is to be able to correctly identify the dates and amounts of two small test deposit transactions, which could be done with just read-only access.
Most banks only support a single full access password per account, and there you have a bigger potential risk of actual fraudulent activity.
But if you discover such activity and report it in a timely manner, you should be refunded. Make sure to check your account frequently. Also make sure to change your passwords once in a while.
With Mint you are without a doubt telling a third party your username and password. If mint gets compromised, or hires a bad actor, technically there isn't anything to stop shenanigans. You simply must be vigilant and be aware of your rights and the legal protections you have against fraud.
For all the technical expertise and careful security they put in place, we the customers have to know that there is not, nor will there ever be, a perfectly secure system.
The trade off is what you can do for the increased risk. And when taken into the picture of all the Other* ways you banking information is exposed, and how little you can do about it, mint.com is only a minor increase in risk in my opinion.
*See paypal, a check's routing numbers, any e-commerce site you shop at, every bank that has an online facing system, your HR dept's direct deposit and every time you swipe your debit / credit card somewhere.
These are all technically risks, some of which are beyond your control to change. Short of keeping your money in your mattress you can't avoid risk. (And then your mattress catches fire.)
Here's a very simple answer, ask your broker/bank. Mine uses ofx. When asked if they would reimburse me for any unauthorized activity, the answer was no. Simple enough, the banks that use it don't feel its secure enough.
