# CVE-2026-66411: Ecovacs DEEBOT PRO authentication bypass in WebSocket

Source: https://junglewise.ai/threats/cve-2026-66411-ecovacs-deebot-pro-authentication-bypass-in-websocket  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-10. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-66411 · Severity: medium · CVSS 5.3 · Published 2026-08-10

Ecovacs DEEBOT PRO robotic cleaners (M1 and K1VAC models) fail to properly authenticate users connecting via WebSocket communications, allowing unauthenticated attackers to remotely connect and operate the robots. An attacker can take full control of the device, access stored maps and operation logs, and execute arbitrary commands without any authentication credentials.

Technologies: [Ecovacs DEEBOT PRO K1VAC](https://junglewise.ai/threats/technologies/deebot-pro-k1vac), [Ecovacs DEEBOT PRO M1](https://junglewise.ai/threats/technologies/deebot-pro-m1). Vendors: [Ecovacs](https://junglewise.ai/threats/vendors/ecovacs).

## Quick answers

**Is CVE-2026-66411 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-66411 being exploited in the wild.

**How severe is CVE-2026-66411?** Medium severity, with a CVSS score of 5.3, published 10 August 2026.

**Which products and versions are affected?** Ecovacs DEEBOT PRO K1VAC prior to V1.7.821; Ecovacs DEEBOT PRO M1 prior to M1-1.7.27.

**Is there a fix for CVE-2026-66411?** A patch was published on 2026-01-31: Initial patches released (M1-1.7.27, K1VAC-1.7.82) Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-66411 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-66411?** Check whether you run Ecovacs DEEBOT PRO K1VAC or Ecovacs DEEBOT PRO M1 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability stems from incorrect implementation of the WebSocket authentication algorithm (CWE-303) in the affected robotic cleaners. The authentication mechanism fails to properly validate client credentials, allowing an unauthenticated network attacker to establish a WebSocket connection and issue commands to the device. The attack requires only network reachability to the device; no credentials, user interaction, or physical access are needed. An attacker can enumerate and retrieve sensitive data (floor maps, operation logs), issue control commands to operate the robot, and potentially execute arbitrary code with device privileges. Patches are available: M1 firmware M1-1.7.27 and later, K1VAC firmware V1.7.821 and later.

## Affected products

- Ecovacs DEEBOT PRO M1 prior to M1-1.7.27
- Ecovacs DEEBOT PRO K1VAC prior to V1.7.821

## Timeline

- 2026-07-31: disclosed
- 2026-01-31: patched: Initial patches released (M1-1.7.27, K1VAC-1.7.82)
- 2026-03-23: patched: Updated patches released (K1VAC V1.7.821 and M1 library update)

## References

- [https://jvn.jp/en/vu/JVNVU92804348/](https://jvn.jp/en/vu/JVNVU92804348/)
- [https://robot.hellohas.co.jp/news/update_20260331/](https://robot.hellohas.co.jp/news/update_20260331/)

## Related threats

- [ECOVACS DEEBOT PRO weak Wi-Fi hotspot password](https://junglewise.ai/threats/cve-2026-66409-ecovacs-deebot-pro-weak-wi-fi-hotspot-password)
- [ECOVACS DEEBOT PRO weak root account password](https://junglewise.ai/threats/cve-2026-66408-ecovacs-deebot-pro-weak-root-account-password)
- [ECOVACS DEEBOT PRO broken cryptographic algorithm in WebSocket authentication](https://junglewise.ai/threats/cve-2026-66407-ecovacs-deebot-pro-broken-cryptographic-algorithm-in-websocket)
- [ECOVACS DEEBOT PRO M1 and K1VAC man-in-the-middle attack via wget without certificate validation](https://junglewise.ai/threats/cve-2026-66406-ecovacs-deebot-pro-m1-and-k1vac-man-in-the-middle-attack-via-wget)
- [ECOVACS DEEBOT PRO telnet authentication bypass](https://junglewise.ai/threats/cve-2026-66405-ecovacs-deebot-pro-telnet-authentication-bypass)