[1] https://serverfault.com/questions/293217/our-security-audito...
I must be missing something, but why is there an expectation that clear text passwords would even be known?
The user is accessing only copy of their data in _our_ systems, the user has no contact with MLS itself directly or indirectly.
Combined with the FSFE not being your "usual" charitable or business organization so setting off auditor red flags and perhaps raising the risk profile of Nexi as a payment processor.