42Crunch for Webhook senders
What middleBrick covers
- Black-box API security scanning under one minute
- Read-only scanning with no agents or SDKs
- Detection of OWASP API Top 10 (2023) findings
- OpenAPI 3.0/3.1 and Swagger 2.0 parsing with ref resolution
- Authenticated scans for bearer, API key, Basic, and cookie auth
- Continuous monitoring and diff detection in Pro tier
Webhook delivery surface overview
Webhook senders initiate outbound callbacks to third-party endpoints, which expands the set of trust boundaries your API interacts with. middleBrick scans the sender configuration and the target URL to identify risks across the OWASP API Top 10 without requiring code access.
Authentication and authorization checks
The scanner evaluates how webhook senders handle authentication, including bearer tokens, API keys, and Basic auth. It checks for JWT misconfigurations such as alg=none, weak algorithms, expired tokens, missing claims, and leakage of sensitive data in claims. Authorization issues covered include BOLA and BFLA, testing for ID enumeration and privilege escalation via admin endpoint probing and role/permission field exposure.
Input validation and data exposure
Webhook senders often transmit structured payloads; middleBrick inspects input validation, CORS wildcard usage with and without credentials, dangerous HTTP methods, and debug endpoints. Data exposure coverage includes PII patterns such as email addresses, Luhn-validated card numbers, context-aware SSN formats, API key fingerprints for AWS, Stripe, GitHub, and Slack, and error or stack-trace leakage that can aid reconnaissance.
Infrastructure safety and compliance mapping
The scanner blocks private IPs, localhost, and cloud metadata endpoints at multiple layers to prevent unsafe probes. It parses OpenAPI specifications with recursive $ref resolution and cross-references definitions against runtime findings. Findings map to PCI-DSS 4.0, SOC 2 Type II, and OWASP API Top 10 (2023), helping you prepare for audit evidence and aligning with security controls described in these frameworks.
LLM and AI security for webhook contexts
When LLM probes are enabled, middleBrick runs 18 adversarial checks across Quick, Standard, and Deep tiers. Tests include system prompt extraction, instruction override, DAN and roleplay jailbreaks, data exfiltration attempts, cost exploitation, base64 and ROT13 encoding bypass, translation-embedded injection, few-shot poisoning, markdown injection, multi-turn manipulation, indirect prompt injection, token smuggling, tool-abuse patterns, nested instruction injection, and PII extraction relevant to webhook payloads.