[Bug][cyber] Browser-based WebUSB firmware installer and device flashing tool (req_011CeDvnkehEQBAGFfoAbBXD)

Triage: kind cyber · domain general · flagging model Sonnet 5 · 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 prompt requested development of a client-side web installer using the WebUSB API to flash firmware to locally connected hardware. This task involves standard WebUSB device communication protocols and user-initiated flashing workflows without exploit delivery or network attacks. The safeguard flagged legitimate client-side device maintenance tooling as offensive cyber activity.

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 2026-08-20T11:33:28.603Z.

Request IDs (lookup-able server-side)

• req_011CeDvnkehEQBAGFfoAbBXD (2026-08-20T11:33:28.603Z)

In-scope justification

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

Block message

API Error: Sonnet 5'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_011CeDvnkehEQBAGFfoAbBXD

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

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_{🔎 Filed automatically by ClAudit v2.2.3 — a FOSS tool for reporting false-positive Claude Code blocks.}