Learn about OWASP Top 10 coverage, SQL injection, XSS, broken authentication, IDOR, CSRF, business logic flaws, session management, and much more, through the Frequently Asked Questions (FAQs) below. Please schedule a consultation if you are looking for Penetration Testing for compliance or regulatory requirements or to comply with a global security standard..
Table of Contents
What vulnerabilities does a web application penetration test look for?
Summary: A comprehensive web application penetration test examines the full OWASP Top 10 2025 vulnerability categories plus application-specific business logic, authentication mechanisms, and session management controls.
A web application penetration test systematically evaluates the following categories of vulnerability: injection flaws (SQL injection, LDAP injection, command injection, and XML injection); broken authentication and session management (weak passwords, predictable session tokens, insecure cookie configuration); broken access control (IDOR, missing function-level access control, privilege escalation between user roles, and SSRF, now consolidated under this category in the OWASP Top 10 2025); security misconfigurations (default credentials, unnecessary exposed features, permissive CORS policies, insecure HTTP headers); cryptographic failures (weak encryption, sensitive data transmitted in plaintext, improperly implemented TLS); software supply chain failures (vulnerable open-source components and compromised dependencies, a new OWASP Top 10 2025 category at A03); cross-site scripting (XSS, reflected, stored, and DOM-based); insecure direct object references; business logic flaws (bypassing intended workflows, manipulating pricing or authorization logic); insecure file uploads; software and data integrity failures; mishandling of exceptional conditions; and API security issues including improper authentication, rate limiting failures, and BOLA. The OWASP Top 10 2025 and OWASP Web Security Testing Guide v4.2 are the standard frameworks used to ensure complete coverage.
What is SQL injection and how is it tested in a web app pen test?
SQL injection (SQLi) is a critical web application vulnerability that occurs when an application incorporates user-supplied input directly into a database query without proper sanitization or parameterization, allowing an attacker to manipulate the query to extract unauthorized data, modify records, bypass authentication, or execute commands on the database server. In a web application penetration test, SQL injection is tested by systematically submitting crafted payloads, such as single quote characters, SQL operators, and Boolean logic conditions, into every input field, URL parameter, HTTP header, and API parameter that interacts with a backend database. Testers use both manual techniques and tools such as SQLMap to automate detection and exploitation. A confirmed SQL injection vulnerability can allow an attacker to dump entire database contents, extract hashed passwords, access customer records including personal or health data, and in some cases execute operating system commands on the underlying server. Injection is ranked fifth (A05:2025) in the OWASP Top 10 2025 under the broader “Injection” category, reflecting its continued prevalence in real-world applications.
What is cross-site scripting (XSS) and how is it tested?
Cross-site scripting (XSS) is a web application vulnerability in which an attacker injects malicious scripts, typically JavaScript, into web pages that are subsequently viewed by other users. Unlike SQL injection, which targets the server, XSS attacks target other users of the application, allowing attackers to steal session cookies, redirect users to phishing sites, capture keystrokes, or perform actions on behalf of the victim within the application. There are three types of XSS: reflected XSS (the malicious script is included in a URL and reflected back in the response), stored XSS (the script is permanently stored on the server and executed whenever any user views the affected page), and DOM-based XSS (the vulnerability exists in client-side JavaScript that processes user input unsafely). In a penetration test, XSS is tested by submitting JavaScript payloads into all input fields, URL parameters, HTTP headers, and any data reflected back to the browser, using both manual testing and automated tools such as Burp Suite. Stored XSS is considered more severe than reflected XSS because it affects all users who view the compromised page without requiring them to click a malicious link.
What is broken authentication and how is it identified during a pen test?
Broken authentication encompasses vulnerabilities in which an application’s authentication mechanisms can be circumvented, allowing attackers to assume other users’ identities, bypass login controls, or maintain persistent access without valid credentials. Common broken authentication issues include weak or guessable default passwords, missing account lockout mechanisms that allow brute-force attacks, poorly implemented multi-factor authentication that can be bypassed, insecure credential storage (passwords stored in plaintext or with weak hashing algorithms such as MD5 or SHA-1 without salting), predictable session token generation, failure to invalidate sessions after logout, and credential exposure through URL parameters or error messages. During a penetration test, broken authentication is identified by attempting brute-force and credential stuffing attacks against login endpoints, testing for account lockout policies, analyzing session token randomness and expiration behavior, testing logout and session invalidation functionality, reviewing password reset workflows for bypass vulnerabilities, and examining MFA implementation for weaknesses such as SMS interception or OTP reuse.
What is IDOR (Insecure Direct Object Reference) and how is it exploited?
IDOR (Insecure Direct Object Reference) is an access control vulnerability that occurs when an application exposes a direct reference, such as a database key, file name, or user ID, in a URL, API parameter, or form field, and fails to verify that the requesting user has authorization to access the referenced object. An attacker exploits IDOR by manipulating those references to access another user’s data. For example, if a URL reads https://example.com/invoice?id=1234, an attacker who changes id=1234 to id=1235 and receives another user’s invoice has discovered an IDOR vulnerability. IDOR vulnerabilities can expose personally identifiable information (PII), financial records, medical data, account credentials, and any other data stored and referenced by the application. In a penetration test, IDOR is tested by identifying all direct object references in the application (IDs, filenames, account numbers), creating multiple test accounts with different access levels, and systematically attempting to access each other’s data by manipulating references. IDOR is the foundational concept behind the OWASP API Security category of Broken Object Level Authorization (BOLA).
What is a CSRF (Cross-Site Request Forgery) vulnerability?
CSRF (Cross-Site Request Forgery) is a web application vulnerability in which an attacker tricks an authenticated user into unknowingly submitting a forged HTTP request to a web application, causing the application to perform an action on the user’s behalf without their knowledge or consent. Because the request originates from the victim’s authenticated browser session, the application processes it as legitimate. CSRF attacks can be used to transfer funds, change account settings, modify passwords, add admin users, or perform any state-changing action the victim is authorized to perform. For example, if a banking application processes fund transfers via a GET or POST request without a CSRF token, an attacker can embed a malicious link or hidden form on any website that, when visited by an authenticated bank user, silently initiates a transfer to the attacker’s account. Penetration testers identify CSRF vulnerabilities by examining whether state-changing requests include unpredictable, user-specific CSRF tokens, whether the application validates the Origin and Referer headers, and whether SameSite cookie attributes are properly configured.
What is business logic testing in a web application pen test?
Business logic testing is the examination of a web application’s intended workflows and functional rules to identify ways an attacker could manipulate them to gain unauthorized benefits or access, vulnerabilities that technical security controls such as input validation or access control checks cannot prevent because they require understanding of the application’s intended purpose. Business logic flaws are among the hardest vulnerabilities for automated tools to detect because they require human understanding of how the application is supposed to work. Examples of business logic vulnerabilities include bypassing a multi-step checkout process to purchase items without payment, manipulating quantity fields to negative numbers to receive a credit rather than a charge, exploiting workflow sequencing flaws to skip required approval steps, abusing coupon or discount code logic to apply unauthorized discounts, and accessing administrative functionality by manipulating user role parameters. During a penetration test, business logic testing requires the tester to deeply understand the application’s intended behavior and then systematically test for deviations, a process that is almost exclusively manual and requires significant application-specific context.
How is authentication and session management tested in a web application?
Authentication and session management testing in a web application penetration test evaluates every aspect of how the application establishes, maintains, and terminates user identity. Testing covers login security (password strength requirements, account lockout after failed attempts, username enumeration through error message differences), multi-factor authentication implementation (MFA bypass attempts, OTP reuse, step-up authentication bypass), session token security (randomness and entropy of session tokens to prevent prediction, transmission security via HTTPS only, proper session expiration timeouts), cookie security attributes (HttpOnly flag to prevent JavaScript access, Secure flag to prevent transmission over HTTP, SameSite attribute for CSRF protection), logout functionality (complete session invalidation on the server side, not just client-side cookie deletion), and password reset flows (token expiration, predictable token generation, race conditions). Testers also check for concurrent session management, whether multiple active sessions per user are permitted and properly managed, and review whether the application enforces re-authentication for sensitive operations such as password changes or payment initiation.
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