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CyberSecurityUPandClaude Opus 5
40b047b9e7
Written against what disclosed bug-bounty reports and public write-ups actually turn up, and chosen by diffing the existing 245 skills rather than restating them. Each one is built around the same discipline the harness now enforces: the client-side discovery is a lead, and the finding is what the SERVER did. Browser instrumentation and client trust: - browser_runtime_hooking — hook fetch/XHR/postMessage/storage/WebCrypto at document_start to find what the client is trusted to decide, then prove the server accepts the tampered value with an independent read-back. - prototype_pollution_gadget_hunt — pollution is a precondition, not a finding. Hunt the gadget with a getter on Object.prototype that breaks into the debugger, quote it as file:line from the bundle, and prove the end effect. - js_source_deep_analysis — recover original sources from source maps, extract the API surface the UI never shows, and pair every client-side discovery with the server request that confirms or refutes it. - client_side_path_traversal — the evidence is which URL left the browser, and it is Low until chained to something otherwise unreachable. Authentication: - webauthn_passkey_downgrade — passkeys as a system: the usual finding is a weaker factor nobody removed, or enrollment needing only a session. - email_verification_bypass — the gate is normally on the login screen, not the API; address normalisation is where pre-account-takeover lives. - jwt_jku_x5u_injection — whether the token gets to choose its own verifier. Server-side reach and money: - ssrf_render_pipeline — PDF/screenshot/unfurl renderers browse on the server's behalf, usually with no egress restrictions and often with JS enabled; the returned document is the exfiltration channel. - payment_webhook_forgery — prove the ORDER changed state, not that the endpoint returned 200; idempotency failures are their own finding. - presigned_url_abuse — the bug is what the API is willing to SIGN, which is an IDOR with a cloud signature on top. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>