Mobile App Security: Protect Your Company’s Data
Discover how to protect your company’s and customers’ data in mobile apps while balancing security controls, privacy, and a trustworthy user experience.
Mobile app security involves more than protecting code. The app runs on a device your company does not control and that can be inspected, while data moves through the device, the network, third-party services, and the back end. Understanding these exposure points helps you define proportionate controls and ask for concrete safeguards before launch and throughout the app’s operation.
Mobile app security: what changes and where data is exposed
With an app, part of the software is installed on a device outside the company’s direct control. That is why important access and authorization decisions cannot rely only on the interface or on information stored in the app itself. Someone can examine the installed package and observe the traffic it exchanges with services. This possibility does not, by itself, mean there is a vulnerability, but it changes the starting point for protection.
Credentials, session tokens, temporary files, cache, logs, and backups can leave traces on the device. In communication between the app and server, an inadequate configuration can expose data in transit. The API and back end need to verify identity and permissions for every operation because the app screen is not a reliable barrier. When building a product, business app development should account for these exposure points from the design stage.
SDKs can receive information and expand the flow of data. These embedded components support functions such as usage analytics, payments, or notifications. Map which data each component can access and where it sends that data. Risk can come not only from your company’s code, but also from an integration that receives more information than its function requires.
Inspecting a package or observing traffic is different from assessing an app’s security. Inspection reveals what can be observed, while a planned assessment defines scope, looks for specific risks, and checks how controls behave. This distinction matters to you: potential exposure helps frame the right questions, but does not replace an assessment suited to the app, data, and integrations involved.
Common technical risks in mobile apps
- Credentials or tokens that are not adequately protected on the device can make it easier to access an account if the device or app files are exposed. Manage the token lifecycle, including expiration and revocation.
- Communication that does not correctly validate the server certificate can allow exchanged data to be intercepted or changed. Encryption for mobile app data needs to protect the channel, not just exist as a nominal setting.
- Weak authentication and sessions that remain valid longer than necessary increase the impact of compromised credentials. An account may remain accessible after access is no longer needed or should be ended.
- When authorization is checked only in the interface, someone may try to access a function through the service even if the screen hides it. The server needs to confirm what each account can view or change.
- Keys and secrets embedded in the package can be extracted and reused. Code obfuscation makes reading code harder, but it does not turn a secret distributed on a device into a trustworthy secret.
- Excessive permissions give an app access to resources it does not need. A data breach can have a greater impact when collection or storage goes beyond what the product requires.
- SDKs and dependencies also deserve attention. A component may collect or transmit more data than expected and introduce risks to consider when updating it. OWASP MASVS organizes controls that can guide this technical discussion.
App fraud: when credentials are legitimate
Account takeover
Phishing, social engineering, or password reuse can provide valid access. Encryption protects data, but it does not confirm that the authenticated person should use that account.
Cloned or modified app
A modified copy can impersonate the official app and prompt you to share data. Identity management and signals of unusual use help reduce the risk.
Automation and emulators
Automated actions or environments that simulate devices can create artificial activity or put pressure on services. Context helps distinguish expected use from suspicious activity.
Benefit abuse
Promotions and cashback can be used outside the rules, including through multiple accounts or coordinated activity. Appropriate limits and pattern analysis support mobile app fraud prevention.
These cases differ from exploiting a technical vulnerability. Access may happen with legitimate credentials, even when they are used by someone without authorization or against the rules. A response can therefore combine multifactor authentication, confirmation of sensitive actions, and monitoring for signals such as unusual changes in device, location, or usage patterns. No single signal proves fraud, and no control blocks every scenario. The goal is to reduce opportunities and provide context for a proportionate response.
Controls that protect company and customer data
Mobile app data protection works best when each measure addresses a specific risk. When speaking with your team, ask them to connect the controls below to the app’s data, functions, and usage profile.
| Layer | Control | Risk reduced |
|---|---|---|
| Identity and session | MFA where appropriate, device biometrics, and token expiration and revocation. | Reduces prolonged use of compromised accounts or sessions. |
| Data on the device | Encryption and storage protected by the operating system. Avoid storing unnecessary data. | Limits exposure if a device is lost or files become accessible. |
| Data in transit | An encrypted channel and validation of the service certificate. | Makes communication harder to intercept or alter. |
| API | Authorize on the server, validate inputs, and limit requests. | Avoids relying on the interface and reduces abuse of functions and services. |
| Code and dependencies | Keep secrets out of the package. Consider obfuscation and root or jailbreak detection. | Makes package analysis harder and flags higher-risk environments. |
| Monitoring | Record relevant events and track anomalous behavior. | Helps detect incidents and fraud attempts with more context. |
MFA, or multifactor authentication, adds a confirmation step beyond the password. A keystore is an operating system resource that helps protect keys stored on the device. For APIs, request limits help manage call volume, while server-side authorization confirms what each account can do. Obfuscation and detection of rooted or jailbroken devices are complementary measures. They raise the difficulty of analysis or provide signals that can inform a response, but they do not guarantee protection. Monitoring supports detection without replacing preventive safeguards.
Internal business app or customer-facing app: what changes
The app’s purpose and audience change its exposure profile. An internal app may bring together business functions, corporate identities, and operational data such as inventory, customer service, or company processes. An app for customers handles data collected through the relationship with the public. Depending on its purpose, that data may include registration details, transactions, preferences, or location. Neither model is automatically more secure. Architecture, data, and controls need to be considered together.
Internal use
Corporate identities and operational data call for role-based access controls. Controlled distribution and MDM help manage devices, but do not replace app or API security.
Customer-facing
Registration and transaction data call for attention to privacy and fraud. Device variety makes compatibility, updates, and authentication important.
In an internal environment, the company can limit distribution to authorized people and managed devices. MDM, or mobile device management, can apply configurations, support access removal, and help respond to lost devices. Even so, it does not by itself prevent a compromised account, an API vulnerability, or misuse of data by an integration. Authorized personal devices can also reduce direct control over storage and configuration.
For a customer-facing app, distribution through app stores means a wider variety of device models, operating system versions, and network conditions. Your company needs to consider proportionate fraud prevention, a workable authentication experience, and clear privacy practices. The volume and variety of interactions also shape monitoring and responses to anomalous behavior.
Regulatory exposure does not depend only on whether an app is internal or external. It depends on the data handled, the industry, the integrations, and the contexts in which the app is used. Work with your legal and security teams to define applicable requirements and turn them into verifiable controls and responsibilities. The Ambev case study on sponsored event management documents a legal and financial bottleneck and a single, automated, traceable workflow on a web and mobile platform. The case illustrates a process solution, not a security delivery.
LGPD and privacy: design decisions for mobile apps
LGPD considerations for mobile apps start with clear decisions about data. For every piece of information collected, your team should know its purpose, who uses it, how long it is kept, and whether it is shared with third parties. The review should include SDKs because data sent through these components is also part of the app’s data flow. Collecting less reduces exposure and can simplify operations.
- ✓Is the purpose of each data item documented, and can your team explain why it is necessary?
- ✓Do the permissions requested by the operating system correspond to a clear app function?
- ✓Do you know what data each SDK receives, how it is used, and which integrations receive it?
- ✓Does the product provide for retention, deletion, and ways to route data-related requests through company channels?
- ✓Do the responsible teams know how to route privacy questions and incidents according to company policies?
These questions help turn privacy into product and development requirements. The company’s legal team should determine legal bases, obligations, and compliance together with the responsible departments. A technical interpretation of the app is not a substitute. Document decisions as well, so future product or integration changes do not alter data flows without review.
Security through development and maintenance
Secure mobile app development considers threats and data from the design stage and keeps checks in place as the product changes. This does not require turning every step into an extensive audit. It does require defining what needs protection, who is responsible for each control, and how issues will be fixed and reassessed.
- 1Define threats and boundariesIdentify sensitive data, critical functions, integrations, and access profiles. Threat modeling organizes scenarios to help prioritize controls before the architecture is finalized.
- 2Review code and dependenciesStatic application security testing, or SAST, examines code without running the app and can flag risky patterns. Dependency analysis identifies components that need an update or further review.
- 3Test the running appDynamic application security testing, or DAST, checks app and service behavior while they are running. OWASP MASTG provides a technical reference for structuring mobile security testing.
- 4Scope and conduct the testsA penetration test checks how controls withstand defined scenarios within an agreed scope. The results depend on that scope and do not eliminate every risk.
- 5Fix and reassessAssign owners, priorities, and remediation criteria. Reassess relevant areas after changes, because finding an issue does not confirm that the risk has been reduced.
- 6Maintain security as things changeUpdate the app, integrations, and dependencies. Reassess controls when data flows, architecture, or threats change. Publishing in an app store is not the same as a security audit.
If your company is still defining the product, consulting and prototyping can help shape the idea, requirements, and MVP. This work focuses on the product you want to create, not an audit of your internal operations.
To explore the development stages without repeating the process here, see our guide to building a business app. Security complements that planning and remains important after the app is in production.
Checklist to assess your app and estimate the project
Use these questions in a conversation with your team or vendor. Ask for clear answers about what is implemented, where it is documented, and who tracks each item. An initial assessment to define the work is not, by itself, a penetration test or technical audit.
- ✓Where are tokens and credentials stored? How do they expire and get revoked if an account or device loses access?
- ✓What happens to the session and local data if the device is stolen or lost?
- ✓Which SDKs and dependencies are in the app? What data does each component receive, send, and retain?
- ✓Who verifies in the API that an account can perform each action, and how does the team control requests?
- ✓When was the most recent security test? What was its scope, and how were relevant issues fixed?
- ✓How are security events recorded and unusual behavior analyzed without collecting more data than necessary?
- ✓How does the team track updates to libraries, SDKs, and connected services?
- ✓Who receives the findings, prioritizes issues, and tracks the resolution of critical items?
To estimate the effort, consider data sensitivity, applicable regulatory or industry requirements, the number of integrations, test scope, and planned maintenance. Cost and timeline also depend on the app’s current state, its documentation, and the changes needed. A scoping conversation can separate initial discovery from implementation, penetration testing, or an external audit. Do not treat a preliminary conversation as evidence that controls have been tested.
Frequently asked questions about mobile app security
What are the main mobile app security risks?
Common risks include unprotected local storage, misconfigured communication, sessions without proper controls, insufficient API authorization, exposed secrets, and dependencies that handle data unnecessarily. Fraud involving legitimate credentials also calls for identity controls and monitoring.
How can I tell whether my company’s app is secure?
Start by checking stored data, authentication, API authorization, integrations, completed tests, and the remediation process. To understand how controls behave, define a technical assessment with a scope proportionate to the app’s data and functions.
Is an app approved by the App Store and Google Play already secure?
Approval for publication is not the same as a security audit. It does not replace tests and controls defined for the app’s architecture, data, integrations, and behavior.
How does the LGPD apply to a mobile app?
In the design, consider the purpose and necessity of collection, permissions, sharing through SDKs, retention, and ways to route data-related requests. The company’s legal team, together with the responsible departments, should assess compliance.
How much does an app security test cost?
Scope depends on data sensitivity, architecture, integrations, the functions assessed, and the depth of testing. An initial conversation helps define the app and requirements before determining the work involved, without estimating a price before scope is clear.
Take your app’s security to the next level
If you are planning an app, Agence can build a custom solution and account for security requirements throughout development, from integrations to the delivered product. Explore our app development services for businesses. The scope can start with the product your company needs and the functions, data, and audiences it will serve.
If your app is already in production, senior professionals can work with your team on enhancements and fixes. App development services can support the product’s next steps as your needs evolve, with work scoped to the capabilities your team needs to execute. The initial conversation does not mean a technical review has already been performed.
The free initial conversation helps define the app or project, understand the requirements, and discuss next steps. It is not an audit, a conclusive technical assessment, or a free penetration test. This helps you identify whether you need to build, evolve, or fix the app and define suitable work without promises of absolute security.
