PCI DSS Assessment Reveals Gaps Between the Payment Flow and the Documented Security Boundary
Security testing and payment-data mapping exposed why the cardholder data environment needed more than a network diagram and an annual checklist.
Client: Enterprise Commerce Organisation
The challenge
The Payment Architecture Had Changed. The Compliance Scope Had Not Kept Up.
The organisation had introduced new application integrations and changes to its payment workflows, while its documented cardholder data environment continued to reflect an earlier architecture. The security team needed to establish where payment data travelled, which systems could affect its security and whether the stated segmentation boundaries held up under testing.
- Payment-flow diagrams did not consistently match the deployed architecture.
- Third-party components and application integrations complicated scoping decisions.
- Network segmentation had been documented but required technical validation.
- Security findings, remediation records and compliance evidence were maintained separately.
The solution
Trace the Data, Test the Boundary and Build the Evidence Trail
Security Brigade combined payment-flow review, technical security assessment and PCI DSS v4.0.1 control mapping. The objective was to identify the systems and connections relevant to the cardholder data environment, test applicable controls and produce evidence that could be reviewed by the organisation's compliance team and assessor.
Our approach
- 01Trace payment-data flows and identify systems that store, process, transmit or could affect the security of cardholder data.
- 02Review segmentation architecture, access paths, supporting infrastructure and relevant application integrations.
- 03Perform authorised testing of the applicable security boundaries and investigate deviations from documented design.
- 04Record remediation actions, validate corrective changes and assemble supporting evidence for the PCI DSS assessment process.
The results
A Defensible Scope, with Technical Evidence Behind It
The composite engagement illustrates the difference between declaring a cardholder data environment and demonstrating where its boundaries are enforced. The resulting assessment records connect payment-data flows, technical observations, remediation actions and retest outcomes. The work supports the organisation's PCI DSS compliance process without substituting for a formal compliance determination.
Ready to discuss your security needs?
Talk to our team about a similar engagement for your organisation.
Request a scoping call