API Security for Saudi Financial Services
APIs: The Lifeblood of Digital Financial Services
Application Programming Interfaces (APIs) have become the backbone of digital financial services in Saudi Arabia. From electronic payment applications to Open Banking platforms, Saudi financial institutions rely on thousands of APIs to exchange data and deliver services to their customers and partners.
With this growing reliance come significant security risks. Gartner reports indicate that APIs have become the most frequently exploited attack vector in web applications, with attacks doubling annually. In the financial sector -- where sensitive data flows through these interfaces -- a single API vulnerability can expose millions of financial and personal records.
SAMA Requirements for API Security
The Saudi Central Bank (SAMA) enforces strict API security requirements within the SAMA Cybersecurity Framework. These requirements span several key areas:
Authentication and authorization: Strong authentication mechanisms must be applied to all APIs using approved protocols such as OAuth 2.0 and OpenID Connect. API keys alone are not acceptable as an authentication mechanism for interfaces handling sensitive data.
Encryption in transit: All API communications must be encrypted using TLS 1.2 at minimum (TLS 1.3 recommended). No financial or personal data may be transmitted over unencrypted channels.
Access logging and monitoring: All API access must be logged with sufficient detail for audit and investigation purposes, including caller identity, request nature, response, and timestamp.
Rate limiting: Rate limiting mechanisms must be implemented to prevent abuse, denial-of-service attacks, and large-scale data extraction.
API Security in Open Banking
SAMA has launched the Open Banking initiative that allows third-party financial service providers to access customer banking data through standardized, secure APIs. While this opens the door to innovation, it significantly expands the attack surface.
Informed customer consent: Explicit, specific consent must be obtained from customers before sharing their data with any third party, with the ability to revoke consent at any time.
Provider registration: Every third-party provider must be registered and accredited by SAMA before accessing banking APIs.
Limited access scope: Each third party's access must be restricted to the minimum data necessary to deliver their specific service, following the principle of least privilege.
Key OWASP API Top 10 Threats
OWASP has published a list of the ten most critical API security threats. Development and security teams at Saudi financial institutions must understand and defend against these:
Broken Object Level Authorization (BOLA): The most critical and prevalent threat. It occurs when an API fails to verify that an authenticated user is actually authorized to access the requested object. Example: changing an account number in a request to access another customer's account data.
Broken Authentication: Vulnerabilities in authentication mechanisms that allow attackers to impersonate other users. Includes weakly generated tokens or tokens that never expire.
Broken Object Property Level Authorization: Combines excessive data exposure with mass assignment. Occurs when an API returns properties the caller does not need or accepts modification of properties that should not be modifiable.
Unrestricted Resource Consumption: Absence of restrictions on request size or rate, exposing the service to denial-of-service attacks and resource exhaustion.
Server-Side Request Forgery (SSRF): An attacker exploits an API to send requests to internal services they should not access, potentially exposing sensitive data or enabling compromise of internal systems.
API Security Best Practices
Security by Design
Adopt an API-First Design approach with security requirements embedded at the design phase, not bolted on afterward. Define API specifications using OpenAPI Specification and review them for security before development begins.
Apply the principle of data minimization. Return only the fields the caller actually needs in API responses. Eliminating extraneous fields reduces the impact of any breach.
Validate all inputs (input validation) at the server level. Never rely solely on client-side validation.
API Gateway and Runtime Protection
Use an API Gateway as a centralized control point for all APIs. The gateway handles authentication, rate limiting, logging, and uniform security policy enforcement.
Deploy a Web Application Firewall (WAF) with custom rules to protect APIs from injection attacks, request tampering, and automated bot attacks.
Implement API Runtime Protection to detect suspicious patterns such as object enumeration attempts or sequential access to multiple account data.
API Security Testing
API security testing must be integrated as a core component of the Software Development Lifecycle (SDLC). Essential testing types include:
Penetration testing: Conduct API-specific penetration tests periodically (quarterly at minimum for sensitive interfaces). Focus on BOLA scenarios and authorization bypass.
Static and dynamic analysis (SAST/DAST): Integrate security analysis tools into the CI/CD pipeline to automatically detect vulnerabilities before production deployment.
API inventory: Maintain an up-to-date inventory of all APIs across the organization. Undocumented or forgotten Shadow APIs are among the most dangerous vulnerabilities attackers exploit.
According to Salt Security's 2025 report, 94% of organizations experienced API-related security incidents in the past 12 months. The financial sector is the most targeted due to the high value of accessible data.
Conclusion: API Security Cannot Wait
With the rapid expansion of digital financial services and Open Banking in Saudi Arabia, API security has become the frontline defense for protecting financial and personal data. Financial institutions cannot defer investment in API security without exposing themselves to severe regulatory and financial risks.
We recommend starting with a comprehensive API inventory and security testing according to OWASP API Top 10 standards. Work closely with compliance teams to ensure alignment with SAMA and NCA requirements.