testland/webhook-replay-tests
Tests inbound webhook receivers for replay-attack resistance: capture incoming webhook payloads + headers, replay against the receiver under test, validate the Standard Webhooks signature scheme (svix-id + svix-timestamp + svix-signature, HMAC-SHA256 over `{id}.{timestamp}.{payload}`), svix-id idempotency dedup, and 5-minute timestamp-window enforcement by signing fixtures at runtime. Does NOT cover outbound delivery, retry-on-5xx, or failure-event exhaustion - those belong to an outbound webhook delivery harness. Use when testing the receiving side of a webhook integration.
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Security
1 high severity finding. You should review these findings carefully before considering using this skill.
W007: Insecure credential handling detected in skill instructions.
What this means
The skill handles credentials insecurely by requiring the agent to include secret values verbatim in its generated output. This exposes credentials in the agent’s context and conversation history, creating a risk of data exfiltration.
Why it was flagged
The skill embeds webhook shared secrets as string literals in example calls and demonstrates signing requests with them, which forces an LLM to handle or reproduce secret values verbatim (high exfiltration risk).
- Audited
- Security analysis