we have already been here for a month
If it wasn't disclosed to you in the written lease that a security deposit, including its terms and conditions, then it's questionable wether a landlord , after the signing of the lease, can require it. I Woukd have to say, no
For a residential tenancy a landlord cannot demand additional security. The maximum allowable is 3x the rent. Whatever the money is called (security, last months) it can't exceed first month rent and 2 times that amount as security deposit. No additional pet deposit. No additional anything. There was a recent case where this was clarified. Consult an attorney regarding the specifics of your situation.
You should consult with am attorney in the jurisdiction where your legal issues are pending to obtain legal advice. This is a public forum. Any questions or answers published here should not be construed as the giving or receiving of legal advice or the formation of an attorney-client relationship. All statements contained in this post are intended for the public.
If the wasn't in the lease agreement, then no you don't have to provide a security deposit. If it's in the lease agreement and you moved in before paying it, then yes you do have to provide it to the landlord. This is an issue that you should discuss with an attorney is the landlord seeks to evict you.
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