Forbidden Does’t Mean Impossible — Discovering Hidden Endpoints with 403BypasserIn this article, the researcher discovered a technique for bypassing 403 Forbidden errors and uncovering hidden endpoints.
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Forbidden Does’t Mean Impossible — Discovering Hidden Endpoints with 403Bypasser
In this article, the researcher discovered a technique for bypassing 403 Forbidden errors and uncovering hidden endpoints. The vulnerability stemmed from a lack of proper error handling and insufficient input validation on the application's side. By using the 403Bypasser tool, the researcher sent crafted requests to test for potential bypasses. The payload contained an If-Modified-Since header with a future timestamp. If the response included a 200 OK status instead of the expected 403 Forbidden, it indicated that the endpoint was vulnerable. The researcher found that the application failed to handle invalid timestamps, allowing them to access sensitive information. This flaw could potentially lead to unauthorized data access or information disclosure. The researcher earned $1,500 for this discovery. Proper remediation involves implementing proper input validation for timestamps, as well as thorough error handling. Key lesson: Inadequate error handling and input validation can lead to information disclosure and bypassing intended access restrictions. #BugBounty #InformationDisclosure #403Bypasser #InputValidation #Cybersecurity #WebSecurity -
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