Executive Summary
Online travel companies handle thousands of sensitive transactions every day—from flight bookings and hotel reservations to tour packages and car rentals. With growing reliance on digital payments and third-party integrations, cybersecurity and compliance are essential. This case study explores how CyberSigma helped an Indian online travel company (client name withheld under NDA) achieve PCI DSS v4.0 compliance, address critical vulnerabilities, and build a sustainable compliance framework for long-term cyber resilience.
Client Overview
The client is a fast-growing travel aggregator operating across India with a user base exceeding one million customers. Their platform integrates with multiple airlines, hotels, and third-party payment gateways, processing a high volume of daily transactions. Acquiring banks and payment partners required PCI DSS compliance to continue processing card payments securely.
- Industry: Online Travel Services
- Business model: B2C Travel Aggregator
- Services: Flights, hotels, holiday packages, car rentals
- Platform: Web & mobile apps
- Region: India
Challenge
When the client approached CyberSigma, significant compliance and security challenges posed risks to operations and brand reputation. Leadership recognised the urgent need to meet PCI DSS v4.0 standards for upcoming audits and to build a more secure, trustworthy digital environment.
- Lack of PCI DSS knowledge—internal teams had little awareness of requirements or how to begin
- Failed internal audit triggered by the payment gateway provider
- Unsecured data transmission—cardholder data transmitted without adequate encryption via third-party APIs
- No cardholder data environment (CDE) segmentation—sensitive systems not isolated from general IT
- Insecure web and mobile applications—no formal VAPT had been conducted
- Weak access controls—shared admin accounts, no MFA, insufficient logging
- Incomplete documentation—no policies, network diagrams, or risk assessment reports
Objectives
- Achieve full PCI DSS v4.0 compliance
- Identify and fix critical vulnerabilities across infrastructure and applications
- Establish secure cardholder data practices
- Create all required security documentation and policies
- Prepare the client for a successful external audit with a QSA
- Empower internal teams through training and knowledge transfer
Our Approach
1. Scoping and Gap Assessment
We mapped all systems, networks, applications, and third-party services involved in cardholder data processing, identified the Cardholder Data Environment (CDE), and conducted a gap analysis against the 12 core PCI DSS requirements—revealing over 40 gaps in access control, encryption, vulnerability management, and logging.
2. Remediation Planning & Implementation
Based on the assessment, we created a custom remediation roadmap prioritised by risk and compliance deadlines. Key controls included TLS 1.2+ encryption, payment tokenization, network segmentation isolating the CDE, firewall rules and ACLs, MFA for admin and remote access, role-based access control (RBAC), and log management for real-time monitoring and forensics.
3. Vulnerability Assessment & Penetration Testing (VAPT)
Our team conducted external VAPT on web and mobile applications, internal VAPT on backend servers and databases, and API testing for insecure endpoints, broken authentication, and data leakage. Findings included insecure third-party payment token APIs, XSS in the booking engine, and weak session/cookie settings—all remediated within defined SLAs with confirmed re-testing.
4. Policy Creation & Employee Training
We developed over 15 security policies—including access control, data retention & disposal, incident response, patch management, and change control—and delivered hands-on training for IT/DevOps, developers on secure coding, customer support on sensitive data handling, and senior management on risk and compliance responsibilities.
5. Audit Preparation & QSA Coordination
CyberSigma prepared network and data flow diagrams, asset inventories, daily/monthly/quarterly log reports, evidence of control implementation, and change management logs. We worked closely with a Qualified Security Assessor (QSA) through interviews, control validation, and Report on Compliance (ROC) preparation.
Solution
- Mapped CDE scope and closed 40+ gaps across PCI DSS v4.0 requirements.
- Implemented TLS 1.2+, tokenization, segmentation, MFA, RBAC, and centralised logging.
- Completed external, internal, and API VAPT with SLA-driven remediation and re-tests.
- Delivered 15+ policies and role-based training across IT, engineering, and leadership.
- Prepared full audit evidence and coordinated QSA validation through ROC.
Results
- PCI DSS v4.0 compliance validated within 75 working days with minimal business disruption
- 100% remediation of critical and high-risk vulnerabilities
- Fully documented compliance program, ready for annual audits
- Stronger partner relationships with banks and payment gateways
- Enhanced cybersecurity maturity and employee awareness
Timelines and outcomes reflect the documented engagement record for this client; results vary with scope and readiness.
What We Delivered
- Scope definition and network/data-flow diagrams for the cardholder data environment
- Gap assessment against PCI DSS v4.0.1 with risk-ranked remediation plan
- Evidence pack per requirement (configurations, records, sampled artefacts)
- Formal validation deliverable — Report on Compliance or Self-Assessment Questionnaire with Attestation of Compliance
- Quarterly ASV scan coordination and remediation verification
The standard artefact set for this engagement type; per-client environment and architecture details are shared under NDA during procurement, not published.
Lessons Learned
- Scope decided the budget: every environment that touched cardholder data unnecessarily was cost — segmentation work done early paid for itself before the assessment started.
- v4.0.1’s future-dated controls (MFA for all CDE access, payment-page script controls) were the schedule risk; treating them as day-one requirements removed the crunch.
- Evidence produced continuously beat evidence assembled before the audit — the requests that stall assessments are always for artefacts nobody collected at the time.
Client Testimonial
Talk to the team that ran this engagement
This was a real PCI DSS Compliance Consulting engagement. If you are preparing for the same, speak to a specialist who has delivered it — not a sales rep. We will give you a clear read on your scope, gaps and the fastest path, and reply within four business hours.
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