Web application security is a major challenge for all companies with an online presence. Cyber-attacks are constantly evolving, exploiting the slightest vulnerability to gain access to sensitive data or compromise service availability. In this context, penetration testing (pentesting) is essential to identify and correct security vulnerabilities before they are exploited. But how often should such tests be carried out?
Minimum frequency: once a year
In most cases, an annual penetration test is a good basis. This frequency guarantees a reasonable level of security, taking into account changes in threats and technologies.
An annual pentest also enables us to meet the requirements of cybersecurity insurers or business partners, who may demand concrete guarantees of system robustness.
Adapt the frequency to the project context
Although once a year is a good starting point, it is not sufficient for all projects. Several factors need to be taken into account when adjusting the regularity of penetration tests:
Infrastructure size
The more complex a web application, with numerous interfaces, microservices or external dependencies, the greater the attack surface. An e-commerce site with a back-office, a customer area and a public API will naturally require more frequent testing than a static showcase site.
Update frequency
A fast-moving project, with frequent production releases, more often exposes new functionalities - and therefore potentially new vulnerabilities. In this case, it is advisable to schedule a penetration test for each major release, or after significant changes, such as the addition of a payment system or the integration of a third-party service.
Sensitivity of processed data
A site handling personal, banking or health information requires extra vigilance. The more sensitive the data, the higher the stakes in the event of compromise. It may therefore be appropriate to supplement one-off penetration tests with regular monitoring, such as automated vulnerability scans, or an intrusion detection strategy (IDS/IPS).
Integrating penetration testing into an overall security strategy
Intrusion testing should not be seen as a simple annual formality. It is part of an ongoing process of security improvement. It is advisable to combine penetration testing with other practices, such as code review, automated security testing, developer training and bug bounty programs.
Testing can also evolve towards more targeted approaches, such as black-box testing (simulation of an attacker without prior information), grey-box testing (with partial access) or white-box testing (with full access to source code), depending on the objectives and desired level of confidence.
Conclusion
There is no universal answer to the question of penetration test frequency. An annual frequency is a good basis for many websites, but it is essential to adapt this frequency according to the nature of the project, its criticality, its complexity, and the frequency of updates.
To assess the appropriate frequency for your situation and reinforce the security of your infrastructure, please contact us. Our team will work with you to define a tailor-made security strategy in line with today's challenges.
