CWE-756: Missing Custom Error Page
The product does not return custom error pages to the user, possibly exposing sensitive information.
How it's found
Missing Custom Error Page is typically found by tracing untrusted input from where it enters the system to the point where it is used without the check or neutralization this weakness describes, combining manual code review with dynamic testing.
Vulnerable vs. safe
<customErrors mode="Off" /><customErrors mode="RemoteOnly" />Consequences
- Read Application Data: Attackers can leverage the additional information provided by a default error page to mount attacks targeted on the framework, database, or other resources used by the application.
How TurboPentest tests for this (white-box)
This weakness (Missing Custom Error Page) is caught by white-box static analysis when you connect a GitHub repo: IntegSec's Opengrep SAST rule pack carries 1 rule for it, flagging the issue directly in your source code as part of the pentest.
Frequently asked questions
What is CWE-756?
The product does not return custom error pages to the user, possibly exposing sensitive information.
How do you find Missing Custom Error Page?
Missing Custom Error Page is typically found by tracing untrusted input from where it enters the system to the point where it is used without the check or neutralization this weakness describes, combining manual code review with dynamic testing.
What is the impact of CWE-756?
Read Application Data: Attackers can leverage the additional information provided by a default error page to mount attacks targeted on the framework, database, or other resources used by the application.
Does TurboPentest test for Missing Custom Error Page?
This weakness (Missing Custom Error Page) is caught by white-box static analysis when you connect a GitHub repo: IntegSec's Opengrep SAST rule pack carries 1 rule for it, flagging the issue directly in your source code as part of the pentest.
Related CWEs
Written and reviewed by
Michel Chamberland - Founder & CEO, IntegSec
CISSP, OSCP, OSCE, CEH, GIAC, CCSK · 20+ years in offensive security
Michel has spent 20+ years on offensive security teams including IBM X-Force Red and Trustwave SpiderLabs, leading penetration tests, red team engagements, and breach response for Fortune 500 customers. He is the founder of IntegSec and the architect of TurboPentest.
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