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Pentest discussion: Reviewing file upload validation

AdminUser

Seeded test discussion. How would you validate reviewing file upload validation in an authorized engagement?

Scenario: Upload small harmless files with mismatched extension and declared MIME type to approved test content. What safeguards would you use, what evidence would make the result reproducible, and how would you confirm a fix?

Comments

AdminUser

Testing approach: Upload small harmless files with mismatched extension and declared MIME type to approved test content. Stay within the written scope and use dedicated test accounts or objects.

AdminUser

Evidence: Record the declared type, detected handling, storage result, and download headers. Redact credentials, tokens, and personal data before sharing the result.

AdminUser

Fix and retest: Validate type and size on the server and serve uploaded files safely. Repeat the original check after deployment and record the outcome.