# CVE-2026-119703: xiaozhi-esp32-server through 0.9.8 Authentication Bypass via Spoofed Device-ID Header

Status: published. Published: 2026-10-30. Updated: 2026-11-04.

xiaozhi-esp32-server through 0.9.8 contains an authentication bypass vulnerability in WebSocketServer._handle_auth that allows remote unauthenticated attackers to skip Bearer HMAC token verification by spoofing the Device-ID header. Attackers supplying an allowlisted MAC-address-shaped device identifier can open an authenticated WebSocket session, issue voice-assistant commands, exchange audio, and read that device's conversation context.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/xinnan-tech/xiaozhi-esp32-server/pull/3457

## Affected products and versions

- xinnan-tech / xiaozhi-esp32-server: ≥ 0; ≤ 0.9.8 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 6.3 (medium); CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 4.8 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N; source: CNA: VulnCheck

- CVSS 4.0: 6.3 (medium); CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 4.8 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.34% as of 2026-11-04; percentile 27.58%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-290

## Exploit evidence

- exploit: https://github.com/xinnan-tech/xiaozhi-esp32-server/issues/3448 (ADP: CISA-ADP)

## References

- https://github.com/xinnan-tech/xiaozhi-esp32-server/issues/3448 (CNA: VulnCheck; issue-tracking)

- https://github.com/xinnan-tech/xiaozhi-esp32-server (CNA: VulnCheck; product)

- https://github.com/xinnan-tech/xiaozhi-esp32-server/blob/v0.9.8/main/xiaozhi-server/core/websocket_server.py#L211-L232 (CNA: VulnCheck; technical-description)

- https://github.com/xinnan-tech/xiaozhi-esp32-server/pull/3457 (CNA: VulnCheck; patch, issue-tracking)

- https://www.vulncheck.com/advisories/xiaozhi-esp32-server-through-0.9.8-authentication-bypass-via-spoofed-device-id-header (CNA: VulnCheck; third-party-advisory)

- https://github.com/xinnan-tech/xiaozhi-esp32-server/issues/3448 (ADP: CISA-ADP; exploit)

- https://github.com/xinnan-tech/xiaozhi-esp32-server (disclosure@vulncheck.com)

- https://github.com/xinnan-tech/xiaozhi-esp32-server/blob/v0.9.8/main/xiaozhi-server/core/websocket_server.py#L211-L232 (disclosure@vulncheck.com)

- https://github.com/xinnan-tech/xiaozhi-esp32-server/issues/3448 (disclosure@vulncheck.com)

- https://github.com/xinnan-tech/xiaozhi-esp32-server/pull/3457 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/xiaozhi-esp32-server-through-0.9.8-authentication-bypass-via-spoofed-device-id-header (disclosure@vulncheck.com)

- https://github.com/xinnan-tech/xiaozhi-esp32-server/issues/3448 (134c704f-9b21-4f2e-91b3-4a467353bcc0)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-119703; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-119703; retrieved 2026-11-05; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-119703; retrieved 2026-11-04; source updated Not reported

Revision: 8d40c98726aff91c43088ac5a25eaf2daad34c09fe235688bd70774642cd60ca

Canonical: https://y2.dev/cve/CVE-2026-119703

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