Blog

Top 10 most crucial web application vulnerabilities

Even if you are not a security tester, it is useful to know the most common vulnerabilities and security problems an application can have. Moreover, it is vital to be able to prevent or deal with them.
17 September 2015
Cybersecurity testing
Web app testing
Article by a1qa
a1qa

Application security is the most critical point for any business regardless of its sphere. Even if you have no relation to web application testing in any way, it is useful to know the most common vulnerabilities and security problems an application can have. Moreover, it is vital to be able to prevent or deal with them.

Open Web Application Security Project (OWASP) is an open project to ensure web applications security. The organization is not affiliated with any company involved in the software development and supports the thoughtful use of security technologies.

TOP 10 most significant vulnerabilities

  • A1 – Injection
  • A2 – Broken Authentication and Session Management
  • A3 – Cross-Site Scripting (XSS)
  • A4 – Insecure Direct Object References
  • A5 – Security Misconfiguration
  • A6 – Sensitive Data Exposure
  • A7 – Missing Function Level Access Control
  • A8 – Cross-Site Request Forgery (CSRF)
  • A9 – Using Components with Known Vulnerabilities
  • A10 – Unvalidated Redirects and Forwards

OWASP has compiled a comprehensive Top Ten list that contains the most dangerous Web application vulnerabilities and provides recommendations for handling those flaws. Here’s list of 10 most critical vulnerabilities.

The purpose of the Top Ten list is to increase the awareness of application security by determining the most critical risks to organizations. The Top Ten list refers to the set of standards, tools and organizations, including MITRE, PCI DSS, DISA, FTC, and many others.

More Posts

30 January 2026,
by a1qa
5 min read
Strategic QA: The foundation of digital transformation
Digital transformation moves fast. Discover how modern QA helps you deliver change at speed by identifying high-stakes risks before they impact your reputation or your bottom line.
Cybersecurity testing
Functional testing
Performance testing
Quality assurance
Usability testing
31 December 2025,
by a1qa
5 min read
OWASP Top 10:2025: what changed and how QA helps reduce risk
As AI speeds up development and attackers exploit business logic, the latest OWASP Top 10 exposes why traditional security checks fall short and how QA must evolve to protect modern web applications.
Cybersecurity testing
25 June 2025,
by a1qa
5 min read
Microservices testing: strategies for resilience, speed, and precision
Learn how a thoughtful QA strategy can keep distributed systems running like clockwork.
Cybersecurity testing
Performance testing
Test automation
14 April 2025,
by a1qa
5 min read
Cybersecurity: Top 5 questions to ask a QA vendor
What information to request from QA providers to get confident in the complete security of your software and protect end-user sensitive data? Read about that in the article.
Cybersecurity testing
2 December 2024,
by a1qa
6 min read
Addressing 4 security issues for digital transformation programs
Find out the top 4 safety challenges of digital transformation and a QA playbook to address them and contribute to a higher level of cybersecurity.
Cybersecurity testing
Migration testing
QA in Fintech
black-friday
5 November 2024,
by a1qa
4 min read
Get ready for Black-Friday-to-Cyber-Monday shopping: 5 testing types to include in your QA strategy
What’s your nightmare during Black Friday and Cyber Monday shopping? If it’s a loss of sales, read about the ways to prevent this in the article.
Cybersecurity testing
Functional testing
Localization testing
Performance testing
Usability testing
QA for retail software
29 August 2024,
by a1qa
4 min read
QA to address key pain points in retail 
Explore how QA helps address the main challenges that retailers face when developing software.
Cybersecurity testing
Functional testing
Performance testing
Usability testing
QA to ensure smooth migration to the cloud
15 August 2024,
by a1qa
3 min read
QA to ensure smooth migration to the cloud
Learn how effectively migrate to the cloud by implementing QA activities.
Cloud-based testing
Cybersecurity testing
Functional testing
Migration testing
Performance testing
Quality assurance
Test automation
QA for fintech
7 May 2024,
by a1qa
5 min read
Navigating the fintech frontier in 2024: QA’s role in delivering high-quality financial software 
Unveil the future of fintech innovations and learn to refine their quality with the help of software testing.
Blockchain app testing
Cybersecurity testing
QA in Fintech
Quality assurance

Get in touch

Please fill in the required field.
Email address seems invalid.
Please fill in the required field.
We use cookies on our website to improve its functionality and to enhance your user experience. We also use cookies for analytics. If you continue to browse this website, we will assume you agree that we can place cookies on your device. For more details, please read our Privacy and Cookies Policy.