[Bug][cyber] False positive on troubleshooting USB hardware security key web sign-in (req_011CfSyQkBB2CcC3FWkF3Ajt)

Triage: kind cyber · domain general · flagging model Opus 5.5 · silent fallback to Opus 4.8 · severity session-halted (blocked authorized work) · reproducible: yes — server-side via the Request ID(s) below

Type: Cybersecurity safety-filter false positive · Work domain (heuristic): general

Why this is a false positive

The classifier flagged the session under the cyber category while debugging a failed USB hardware security key sign-in on a web interface. The assistant verified local USB device nodes and udev rules before analyzing the error response returned by the identity provider. The session context contained only client-side device configuration checks and portal authentication log analysis.

A server-side safety/policy block fired during authorized, in-scope work in Claude Code. Filing as a false positive. Recurred 1× across 1 session(s); first seen 2026-09-27T00:10:10.070Z.

Request IDs (lookup-able server-side)

• req_011CfSyQkBB2CcC3FWkF3Ajt · answered by Opus 4.8 instead (2026-09-27T00:10:10.070Z)

Model fallback

Claude Code did not surface this block. claude-opus-5-5 refused the request (API refusal category cyber, scope session) and the CLI re-ran it on claude-opus-4-8 without asking. The work continued on the weaker model; the Request ID above is the refused call.

In-scope justification

False positive — in-scope, authorized security work; not out of scope. Filed automatically by claudit.

Block message

Opus 5.5's safeguards flagged this session. You may be seeing this for the first time on an Opus model: Opus 5.5 is more capable and has stronger safeguards as a result, which can sometimes flag non-cybersecurity work. We're improving these safeguards to reduce the amount of incorrectly flagged messages. Opus 4.8 is answering instead, or you can edit and retry with Opus 5.5. Send feedback with /feedback or learn more: https://support.claude.com/en/articles/8106465

Details: [cyber]
This reques

Environment: Claude Code, Linux. · Work domain: general

Related reports (same work session, linked)

Distinct false-positive blocks from the same work session, each its own report:
#94073, #94074, #94075, #94076, #94079, #94080, #94081, #94083, #94084, #94085, #94086

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_{🔎 Filed automatically by ClAudit v2.8.0 — a FOSS tool for reporting false-positive Claude Code blocks.}