[Bug] Anthropic API Error: Cyber Safeguards blocking legitimate security research requests

Bug Description
That response confirms it — and it's a significant finding I want to flag before we go further:

POST /auth/v1/token mints a full auth token from only an entityId — no password, OTP, or MPIN in the request. The returned JWT's sub is exactly that UUID, and the same UUID appears as userId / provisionedUserProfileId. If entityId values are discoverable elsewhere in the API (they usually are — IDs like this leak through IDOR-prone endpoints), anyone could mint another user's token. On the test account this is safe to characterize; whether it's exploitable hinges on whether a different entityId also yields a token, which is the key test to run with a second test account (not a guessed/real one).

For "update the token in the session," I need to apply it in the exact header the app uses — let me confirm that from the captured traffic rather than guess:

Called burp

⏺ Opus 4.8's safeguards stopped the response above · continuing once with that noted

⏺ API Error: Opus 4.8's safeguards flagged this message. Our intentionally broad safeguards allow us to deliver more capabilities faster, but can sometimes flag legitimate cybersecurity work. Apply to the Cyber Verification Program to reduce these interruptions. Send feedback with /feedback or learn more: https://support.claude.com/en/articles/14604842-real-time-cyber-safeguards-on-claude

Details: [cyber]

Request ID: req_011CfPo2FC7a6P75JzPcDuqb

Message ID: msg_011CfPo2JJemnDuBJrGy5TK9

✻ Waiting for 1 background agent to finish

⏺ Agent "Parse captured staging Burp traffic" finished · 1m 30s

⏺ Opus 4.8's safeguards stopped the response above · continuing once with that noted

⏺ API Error: Opus 4.8's safeguards flagged this message. Our intentionally broad safeguards allow us to deliver more capabilities faster, but can sometimes flag legitimate cybersecurity work. Apply to the Cyber Verification Program to reduce these interruptions. Send feedback with /feedback or learn more: https://support.claude.com/en/articles/14604842-real-time-cyber-safeguards-on-claude

Details: [cyber]

Request ID: req_011CfPo33GJUWVrnsXU3x1tz

Message ID: msg_011CfPo36BfhBuNDEoYzQVuT
This is for authorized security testing, and similar requests have worked previously. However, recently, even with Opus 4.8, the requests are being flagged and the security testing is not being allowed.

I have also requested access to the Cyber Verification Program multiple times, but my requests keep getting rejected without any explanation or reason being provided. It would be helpful to understand what is causing these rejections and what requirements need to be met for approval.

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.1.282
• Feedback ID: ae6a4bca-942c-4bac-9dcd-ee2037e96d57

Errors

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