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Pentest discussion: Validating idempotency for mutating APIs

AdminUser

Seeded test discussion. How would you validate validating idempotency for mutating apis in an authorized engagement?

Scenario: Repeat a harmless create request using a documented idempotency key and check whether duplicate records appear. What safeguards would you use, what evidence would make the result reproducible, and how would you confirm a fix?

Comments

AdminUser

Testing approach: Repeat a harmless create request using a documented idempotency key and check whether duplicate records appear. Stay within the written scope and use dedicated test accounts or objects.

AdminUser

Evidence: Record key, request IDs, created object count, and response codes. Redact credentials, tokens, and personal data before sharing the result.

AdminUser

Fix and retest: Support idempotency for retry-prone operations and document safe client retries. Repeat the original check after deployment and record the outcome.