Website Security for UK Car Hire and Vehicle Rental Companies

Why Car Hire Websites Hold Sensitive Identity Data

Vehicle rental requires identity verification by design. Customers provide driving licence numbers, licence categories, endorsements, and in many cases passport details to verify their right to hire. This combination of government-issued identity data, home address, payment details, and vehicle assignment records creates a genuinely sensitive data profile.

For car hire companies, a data breach is not just an ICO reporting obligation — it has potential criminal implications. Driving licence data combined with a home address and vehicle booking record is exactly the information needed to facilitate insurance fraud and identity theft in the motor sector.

What Car Hire Websites and Systems Hold

**Driving licence data** — Licence numbers, categories, expiry dates, and endorsement records. The DVLA Check Code service means that some rental companies access live DVLA records linked to customer identity — data with significant fraud potential if misused.

**Identity verification documents** — Passport or identity card data collected for certain rental categories, international renters, and young driver policies.

**Payment and deposit details** — Pre-authorisation holds on payment cards, refundable deposits, and additional charge processing involve ongoing payment data storage.

**Vehicle booking and assignment records** — Records linking a named customer to a specific vehicle for a specific period. Combined with home address, this tells an attacker that a customer's vehicle will be away from their home.

**Damage claims and incident records** — Post-rental damage reports and insurance excess claims contain photographs, damage descriptions, and financial data.

Security Vulnerabilities in Car Hire Platforms

**Driving licence data stored without adequate encryption** — Licence numbers are frequently stored in plaintext in booking databases. Without field-level encryption for identity data, a database breach exposes every customer's driving licence number.

**Booking portals with IDOR vulnerabilities** — Rental account portals that display booking details using predictable booking reference numbers without session validation allow one customer to view another's rental record and associated identity data.

**Overly broad staff access to identity documents** — Uploaded copies of driving licences and passports may be accessible to all staff with system access rather than restricted to those with an operational need.

**Outdated online booking systems** — Legacy rental booking systems with web interfaces are sometimes years behind on security patches. The identity data they contain makes them high-value targets.

**Payment pre-authorisation data handling** — Managing card pre-authorisation holds and processing excess charges requires careful PCI DSS compliance. Systems that retain card data beyond operational need create an ongoing liability.

ICO and GDPR Obligations for Identity Data

The ICO specifically highlights driving licence numbers as personal data requiring strong security measures. Combined with home addresses and payment data, the full rental record is a high-risk data asset.

Organisations that process driving licence data must have documented retention limits and deletion processes. The ICO has taken enforcement action against vehicle operators who retained identity documents longer than necessary.

Yrzo AI scans car hire website booking portals to identify identity data exposure, authentication weaknesses, and payment security gaps before they result in a reportable breach.