10 Web Application Security Risks and Best Practices to Mitigate Them

Quick Summary: Web application security is more critical than ever today with their increasing use across organizations. Understanding the common web app security risks helps you take the right steps to strengthen your security posture. This article covers the top ten security threats for web apps. Check out these threats and make an appropriate security strategy to combat them.

The number of web applications has been on the rise due to easy accessibility to a wider audience. Also, they provide engaging experiences without heavy downloads. Thus, many organizations are moving towards web application development as they become the preferred solutions of their users.

The appealing characteristic of the web app also brings some dark side, which can create a question to the security concern. Due to easy accessibility, web applications tend to spread malicious code faster by hackers or cybercriminals. Basic web application attacks and vulnerabilities are the finest attack patterns, making web application security a serious concern.

Considering the facts and numbers, as per the report, the average cost of data breaches stands at $4.88 million. However, many of these attacks could have been mitigated or prevented if companies had used a proactive and defensive approach to web security.

To ensure adequate safety against web application security threats, in this article, we will explore what are common web application security threats. Also, we will delve into the best practices to prevent them and safeguard your application. We will also define how you can protect your web applications with ZeroThreat – the emerging DAST tool for your applications.

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Top 10 Web Application Security Risks

There are many potential threats that web applications face, which put your organization at risk. Let’s find out the most common threats against web applications and APIs, along with steps to prevent them.

1. Injection Attacks (SQL, Command, AI Prompt)

Injection Attacks happen when applications treat untrusted input as executable instructions. SQL injection targets databases, command injection abuses system-level commands, and AI prompt injection manipulates AI behavior. All three exploit poor input handling and weak execution boundaries.

These risks appear in legacy queries, backend services, and AI-powered features. Attackers use crafted inputs to extract data, execute commands, or override AI intent. If not controlled, injection attacks can result in data breaches, system compromise, and unsafe AI-driven decisions.

How to Prevent Injection Attacks

• Use parameterized queries and prepared statements for all database operations.
• Avoid executing system commands with user input; use safe APIs instead.
• Apply strict input validation using allowlists for expected values only.
• Encode and escape input based on where and how it is processed.
• Enforce least-privilege access for databases, services, and operating system users.
• For AI systems, constrain prompts, validate inputs, and restrict tool or action scope.
• Continuously test injection paths using vulnerability scanners and manual reviews.

2. Broken Access Control

Broken Access Control allows users to access data or functions beyond what their role should permit. Attackers exploit weak or missing authorization checks to access restricted features, view sensitive data, or perform actions meant for higher-privileged users. This often happens when trust is placed on client-side controls.

It is especially common in APIs and role-based systems where permissions are complex. Issues like IDOR, missing role validation, and inconsistent access rules allow attackers to bypass restrictions. If left unaddressed, this risk can lead to sensitive data exposure and privilege escalation.

How to Prevent Broken Access Control

• Enforce authorization checks on the server for every request, regardless of the client or endpoint.
• Validate user roles and permissions against business logic before processing any sensitive action.
• Implement object-level authorization to ensure users can only access resources they own or are assigned.
• Follow a deny-by-default approach and explicitly grant only required permissions.
• Centralize access control logic to avoid inconsistent checks across different components.
• Use role-based or attribute-based access control models that scale with application complexity.
• Regularly test access control using manual reviews, API testing, and penetration testing tools.

3. Cross-Site Scripting (XSS)

Cross-Site Scripting (XSS) enables attackers to inject malicious browser-executed code into trusted web pages. Attackers inject malicious scripts into web pages, which then run in a victim’s browser. This enables session hijacking, data theft, and unauthorized actions.

XSS commonly appears in comment fields, search results, and dynamic UI components. There are three main types: Reflected, Stored, and DOM-based. Since attacks execute in the user’s context, they can bypass security controls and directly impact user trust.

How to Prevent Cross-Site Scripting (XSS)

• Validate and sanitize all user inputs using tools liketools like OWASP AntiSamy.
• Encode output based on context, such as HTML, JavaScript, or URL encoding.
• Use secure templating engines that escape user input by default.
• Implement a strict Content Security Policy (CSP) to limit script execution sources.
• Avoid using dangerous functions like eval() and unsafe DOM manipulation methods.
• Set HttpOnly and Secure flags on cookies to reduce session theft risks.
• Regularly test for XSS using automated vulnerability scanners and manual security testing.

4. Security Misconfiguration

Security Misconfiguration occurs when applications, servers, or frameworks are deployed with insecure default settings. Exposed admin interfaces, open cloud storage, verbose error messages, and unnecessary services create easy entry points for attackers. These issues often arise from rushed deployments or missing hardening steps.

This risk affects web servers, application frameworks, containers, and cloud services alike. Inconsistent configurations across environments make systems unpredictable and hard to secure. Attackers actively scan for misconfigured systems because exploitation requires little effort and often leads to full system compromise.

How to Prevent Security Misconfiguration

• Remove default accounts, sample files, and unnecessary services before production deployment.
• Apply secure configuration baselines for servers, frameworks, containers, and cloud resources.
• Disable detailed error messages and stack traces in production environments.
• Enforce proper security headers such as HSTS, CSP, and X-Frame-Options.
• Restrict access to admin panels and management interfaces using strong authentication.
• Automate configuration checks and compliance validation in CI/CD pipelines.
• Regularly review and update configurations as part of patch and change management.

5. Cross-Site Request Forgery (CSRF)

Cross-Site Request Forgery tricks authenticated users into performing actions they never intended. Attackers trick authenticated users into submitting hidden or forged requests, causing actions like password changes or fund transfers to execute without consent.

CSRF mainly targets applications that rely on cookies for session management. When proper request validation is missing, browsers automatically attach session cookies, making the request appear legitimate. This allows attackers to exploit trusted user sessions and manipulate application state silently.

How to Prevent Cross-Site Request Forgery (CSRF)

• Implement anti-CSRF tokens and validate them for every state-changing request.
• Use SameSite cookie attributes to restrict cross-origin request behavior.
• Require re-authentication or additional verification for critical actions.
• Avoid using GET requests for operations that modify data or application state.
• Validate request headers such as Origin and Referer on sensitive endpoints.
• Apply proper session management with short-lived and securely scoped cookies.
• Regularly test CSRF protections during security reviews and penetration testing.

6. Cryptographic Failures

Cryptographic Failures, formerly known as ‘Sensitive Data Exposure,’ occur when applications fail to properly protect sensitive data using strong encryption. This includes weak algorithms, improper key management, or transmitting data in plain text. Such gaps expose credentials, personal information, and payment data to attackers.

These failures often appear during data storage, authentication, or communication between systems. Using outdated protocols, hardcoded secrets, or incorrect encryption modes weakens security. Once exploited, attackers can intercept, decrypt, or manipulate sensitive data without being detected.

How to Prevent Cryptographic Failures

• Use strong, industry-approved encryption algorithms such as AES-256 and RSA-2048 or higher.
• Enforce TLS encryption for all data in transit, including internal service communication.
• Store sensitive data using secure hashing and salting instead of reversible encryption where possible.
• Protect encryption keys using secret management systems and rotate them regularly.
• Avoid hardcoding secrets, keys, or credentials in source code or configuration files.
• Disable outdated protocols and weak cipher suites across servers and applications.
• Regularly audit cryptographic implementations as part of security assessments.

7. Software Supply Chain Failures

Software Supply Chain Failures are introduced through third-party libraries, frameworks, or build tools. Attackers exploit trusted dependencies to inject malicious code, knowing these components are widely used and rarely scrutinized as closely as first-party code.

Modern web applications rely heavily on open-source packages and external services. Outdated dependencies, compromised repositories, or insecure CI/CD pipelines increase exposure. Once a supply chain component is breached, attackers can impact multiple applications, making detection and containment extremely difficult.

How to Prevent Software Supply Chain Failures

• Maintain a complete inventory of third-party libraries and dependencies in use.
• Regularly update dependencies and remove unused or unsupported packages.
• Use software composition analysis (SCA) tools to detect known vulnerabilities.
• Verify package integrity using checksums, signatures, and trusted repositories.
• Secure CI/CD pipelines by restricting access and monitoring build processes.
• Avoid downloading dependencies from unverified or unofficial sources.
• Continuously monitor for new vulnerabilities affecting critical components.

8. Authentication Failures

Authentication Failures arise when identity verification mechanisms are poorly designed or implemented. Weak password policies, broken login logic, and insecure credential handling allow attackers to bypass authentication or take over user accounts. This risk directly exposes sensitive data and protected functionality.

These failures often appear in login flows, password recovery, and token management. Missing rate limits, predictable credentials, and improper session handling increase attack success. Once exploited, attackers can impersonate users, escalate privileges, and maintain long-term unauthorized access.

How to Prevent Authentication Failures

• Enforce strong password policies with length, complexity, and reuse restrictions.
• Implement multi-factor authentication for user and administrative accounts.
• Apply rate limiting and account lockout mechanisms to prevent brute-force attacks.
• Secure password storage using strong hashing algorithms with proper salting.
• Use secure, time-bound tokens for authentication and session management.
• Avoid exposing detailed authentication error messages to users.
• Regularly test authentication workflows through security reviews and testing.

9. Server-Side Request Forgery (SSRF)

Server-Side Request Forgery allows attackers to misuse the server as a proxy to internal resources. By manipulating URLs or request parameters, attackers force the server to access internal services, cloud metadata endpoints, or restricted network resources that are not publicly exposed.

SSRF commonly affects applications that fetch external resources, such as webhooks, file imports, or URL previews. Without proper validation, attackers can scan internal networks or extract sensitive cloud credentials. This risk often leads to data leaks and deeper infrastructure compromise.

How to Prevent Server-Side Request Forgery (SSRF)

• Validate and restrict user-supplied URLs using allowlists instead of blocklists.
• Prevent access to internal IP ranges, localhost, and cloud metadata services.
• Disable unnecessary outbound network access from application servers.
• Use DNS and URL parsing protections to prevent redirection-based bypasses.
• Enforce strict request timeouts and response size limits.
• Monitor and log outbound requests for suspicious patterns.
• Regularly test SSRF scenarios during penetration testing and security reviews.

10. Security Logging and Alerting Failures

Security Logging and Alerting Failures occur when applications do not record or monitor security-relevant events effectively. Failed logins, access violations, and suspicious activities go unnoticed, allowing attackers to operate silently. Without proper visibility, breaches remain undetected for long periods.

This risk often results from incomplete logs, poor log retention, or a lack of monitoring. When alerts are missing or ignored, teams cannot respond quickly. Delayed detection increases the impact of attacks, leading to data loss, compliance issues, and extended system compromise.

How to Prevent Security Logging and Alerting Failures

• Log all critical security events, including authentication failures and access violations.
• Ensure logs include sufficient context such as user IDs, IP addresses, and timestamps.
• Protect logs from tampering and ensure proper retention policies are in place.
• Centralize logs using a SIEM or logging platform for correlation and analysis.
• Configure real-time alerts for suspicious or high-risk activities.
• Regularly review logs and alert rules to reduce noise and improve accuracy.
• Test logging and alerting mechanisms during incident response simulation.

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What is the Biggest Security Threat to a Web Application?

No specific security threats or vulnerabilities are considered the biggest to the web application. It actually depends on the specific web application and its unique vulnerabilities.

However, the OWASP Top 10 lists injection (including SQL injection and cross-site scripting) and broken access control as the most frequent application security threats. Developers and their organizations can reduce their exposure by implementing the newest secure coding practices and security scanning and monitoring tools like ZeroThreat.

In a nutshell, it’s essential to maintain a 360-degree security vision. Consider the OWASP Top 10 Vulnerabilities as a starting point and add create strategies based on your specific requirements.

Prevent Security Risks to Your Web Application with ZeroThreat

Since web applications are an integral part of modern life, they have become a common target for cybercriminals. The proper practice is to understand security threats and mitigate them before they cause any damage. Therefore, web application developers and administrators have to follow the right security approach to protect the systems and users. To assist with this process, consider using a versatile and easy-to-use Dynamic Application Security Testing (DAST) platform like ZeroThreat to scan your application thoroughly and safeguard it from any threat.

ZeroThreat provides 10x time faster scanning operations and reports by adding penetration testing into your CI/CD pipelines. ZeroThreat examines the running application for threats or vulnerabilities that are listed by OWASP Top 10 and more. This allows developers to examine the reports for each test that’s executed, discover vulnerabilities, and fix issues. The best part about ZeroThreat is that all of this is possible prior to the application going live. To leverage multiple features and benefits of ZeroThreat, sign up today for a free trial.