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Even though the web site never sees the cardholder data or sensitive authentication data in the clear, and never has access to the encryption keys, I would think the web site is in-scope because it could affect the security of the data. If the web site is hacked and changes the redirect to go to a hacker site, data can then be stolen.

In the case I am working now, the web site is owned by a service provider that a merchant is working with. The service provider is not the 3rd party that deals with the card data. If I am correct it leads to a slightly weird situation where there is no CDE (cardholder data environment) at the service provider and they only have this one web server that is in-scope. Although there is a question of whether other servers on the same network "segment" as the web server should get pulled in-scope too, but that is a different issue.

0

Yes. You are still in scope, although a lower level of compliance may apply to you. Read the following:

Q2: To whom does the PCI DSS apply?

A: The PCI DSS applies to ANY organization, regardless of size or number of transactions, that accepts, transmits or stores any cardholder data.

Source: To Whom does PCI DSS apply?

You may qualify for one of the less restrictive levels of PCI-DSS. To find out, check this link: Which SAQ is appropriate for me?

Here is a good reference to get you started on your own compliance: ComplianceGuide.org.

1
  • In the specific case I am looking at, a full ROC is required for the service provider. If a ROC were not required SAQ-A would fit the bill. There is an FAQ that indicates that when a ROC is needed, if a particular SAQ would have otherwise fit, that SAQ can guide which requirements in the ROC are relevant or not-applicable. However SAQ-A is only for merchants, so doesn't seem to help me.
    – knokej
    May 16 '19 at 13:33

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