Hackers map opportunities, not screens<\/strong><\/h2>\nAt the beginning of an attack, a threat actor does not read the UI the way a regular user does. Instead, they build a map of opportunities. They look for data entry forms, registration and password recovery flows, and identify the roles available within the system, such as guest, user, manager, or administrator.<\/p>\n
Another area of focus is the set of states that rarely appear in design mockups. For example, what happens if a password reset link has expired, if a user opens someone else\u2019s invoice, or if a session expires in the middle of an action. Vulnerabilities are often found within these edge-case scenarios.<\/p>\n
Where design decisions influence security<\/strong><\/h2>\nDesigners are not responsible for every vulnerability. However, they can influence a product\u2019s security through user flow logic long before the first line of code is written. A few common examples can be seen below:<\/p>\n
\n- Excessively specific login error messages.<\/strong> If a system displays messages such as \u201cthis email does not exist\u201d or \u201cincorrect password,\u201d it provides attackers with clues about whether an account exists in the database. A neutral message such as \u201cinvalid credentials\u201d is a safer option.<\/li>\n
- The same interface for different user roles.<\/strong> When managers and administrators see nearly identical screens but have different permissions, the boundaries between roles become less clear. These are exactly the kinds of areas attackers tend to investigate first.<\/li>\n
- Share links, invite links, and magic links.<\/strong> If factors such as expiration periods, access revocation, and intended recipients are not carefully considered, these features can introduce weaknesses into the authorization logic.<\/li>\n<\/ul>\n
What is a web application pentest and why designers should care<\/strong><\/h2>\nNow that it is clear how an attacker thinks, it becomes easier to understand what a web app pentest actually is. A web app pentest examines how the application would withstand the techniques used by an actual attacker. It involves testing user flows, roles, forms, authentication mechanisms, user accounts, file uploads, checkout processes, password reset functionality, and hidden administrative features.<\/p>\n
If usability testing reveals where users become confused or frustrated, a pentest reveals where attackers may have an advantage. A penetration tester does not simply run automated scans against a website. Instead, they follow the same paths a real attacker would take, looking for opportunities to manipulate parameters, bypass controls, escalate privileges, or gain access to other users\u2019 data.<\/p>\n
The result is not a list of abstract vulnerabilities. It is a set of practical attack scenarios that demonstrate how an attack could unfold and what consequences it could have for both the product and the business.<\/p>\n
![\"6a41ff857b70e.webp\"](\"https:\/\/artimg.info\/6a41ff857b70e.webp\")
<\/p>\n
What designers can do ahead of pentest<\/strong><\/h2>\nA designer does not need penetration testing expertise to contribute to product security. However, they can help surface potential issues much earlier, at the design stage, when fixing them is significantly less expensive.<\/p>\n
A few practical steps include:<\/p>\n
\n- Document roles and permissions directly within user flows instead of leaving them solely for development teams to define.<\/li>\n
- Design not only the happy path but also edge cases, such as error states, account lockouts, expired links, and insufficient access permissions.<\/li>\n
- Include states such as \u201caccess denied,\u201d \u201csession expired,\u201d \u201clink expired,\u201d and \u201cfile rejected\u201d rather than leaving them undefined.<\/li>\n
- Avoid exposing unnecessary information in error messages.<\/li>\n
- Carefully design the behavior of share links and invite links, including expiration periods, access restrictions, and revocation options.<\/li>\n
- Ask security-focused questions during the design process: \u201cWhat happens if a user attempts this action without the required permissions?\u201d, \u201cCan one role access another role\u2019s data?\u201d, or \u201cWhat happens after logout?\u201d<\/li>\n<\/ol>\n
These practices do not replace the work of a security team. However, when designers consider potential misuse scenarios during the wireframing and prototyping stages, they can help reduce the number of logical flaws that may later be identified during a penetration test.<\/p>\n
Taking these precautions can make a product more secure, but dedicated penetration testing remains essential. External security experts play an important role because they can identify weaknesses that may appear safe during the design phase but create serious risks during real-world attacks.<\/p>\n
Designers are not responsible for every vulnerability. However, they can influence a product\u2019s security through user flow logic long before the first line of code is written. A few common examples can be seen below:<\/p>\n
- \n
- Excessively specific login error messages.<\/strong> If a system displays messages such as \u201cthis email does not exist\u201d or \u201cincorrect password,\u201d it provides attackers with clues about whether an account exists in the database. A neutral message such as \u201cinvalid credentials\u201d is a safer option.<\/li>\n
- The same interface for different user roles.<\/strong> When managers and administrators see nearly identical screens but have different permissions, the boundaries between roles become less clear. These are exactly the kinds of areas attackers tend to investigate first.<\/li>\n
- Share links, invite links, and magic links.<\/strong> If factors such as expiration periods, access revocation, and intended recipients are not carefully considered, these features can introduce weaknesses into the authorization logic.<\/li>\n<\/ul>\n
What is a web application pentest and why designers should care<\/strong><\/h2>\n
Now that it is clear how an attacker thinks, it becomes easier to understand what a web app pentest actually is. A web app pentest examines how the application would withstand the techniques used by an actual attacker. It involves testing user flows, roles, forms, authentication mechanisms, user accounts, file uploads, checkout processes, password reset functionality, and hidden administrative features.<\/p>\n
If usability testing reveals where users become confused or frustrated, a pentest reveals where attackers may have an advantage. A penetration tester does not simply run automated scans against a website. Instead, they follow the same paths a real attacker would take, looking for opportunities to manipulate parameters, bypass controls, escalate privileges, or gain access to other users\u2019 data.<\/p>\n
The result is not a list of abstract vulnerabilities. It is a set of practical attack scenarios that demonstrate how an attack could unfold and what consequences it could have for both the product and the business.<\/p>\n
<\/p>\nWhat designers can do ahead of pentest<\/strong><\/h2>\n
A designer does not need penetration testing expertise to contribute to product security. However, they can help surface potential issues much earlier, at the design stage, when fixing them is significantly less expensive.<\/p>\n
A few practical steps include:<\/p>\n
- \n
- Document roles and permissions directly within user flows instead of leaving them solely for development teams to define.<\/li>\n
- Design not only the happy path but also edge cases, such as error states, account lockouts, expired links, and insufficient access permissions.<\/li>\n
- Include states such as \u201caccess denied,\u201d \u201csession expired,\u201d \u201clink expired,\u201d and \u201cfile rejected\u201d rather than leaving them undefined.<\/li>\n
- Avoid exposing unnecessary information in error messages.<\/li>\n
- Carefully design the behavior of share links and invite links, including expiration periods, access restrictions, and revocation options.<\/li>\n
- Ask security-focused questions during the design process: \u201cWhat happens if a user attempts this action without the required permissions?\u201d, \u201cCan one role access another role\u2019s data?\u201d, or \u201cWhat happens after logout?\u201d<\/li>\n<\/ol>\n
These practices do not replace the work of a security team. However, when designers consider potential misuse scenarios during the wireframing and prototyping stages, they can help reduce the number of logical flaws that may later be identified during a penetration test.<\/p>\n
Taking these precautions can make a product more secure, but dedicated penetration testing remains essential. External security experts play an important role because they can identify weaknesses that may appear safe during the design phase but create serious risks during real-world attacks.<\/p>\n
- The same interface for different user roles.<\/strong> When managers and administrators see nearly identical screens but have different permissions, the boundaries between roles become less clear. These are exactly the kinds of areas attackers tend to investigate first.<\/li>\n