# CVE-2026-76943: Xiiaozet LK100W authentication bypass in administrative service

Source: https://junglewise.ai/threats/cve-2026-76943-xiiaozet-lk100w-authentication-bypass-in-administrative-service  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-28. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-76943 · Severity: critical · CVSS 9.8 · Published 2026-08-28

The Xiiaozet LK100W is an industrial control device deployed globally in critical infrastructure. A weakness in its administrative service allows attackers to bypass authentication and gain command execution capabilities, potentially leading to complete device compromise and unauthorized access to sensitive infrastructure.

Technologies: [Xiiaozet LK100W](https://junglewise.ai/threats/technologies/lk100w). Vendors: [Xiiaozet](https://junglewise.ai/threats/vendors/xiiaozet).

## Quick answers

**Is CVE-2026-76943 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-76943 being exploited in the wild.

**How severe is CVE-2026-76943?** Critical severity, with a CVSS score of 9.8, published 28 August 2026.

**Which products and versions are affected?** Xiiaozet LK100W <2.1.240.

**Is there a fix for CVE-2026-76943?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-76943 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-76943?** Check whether you run Xiiaozet LK100W 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

CVE-2026-76943 is an authentication bypass vulnerability (CWE-288) in the Xiiaozet LK100W administrative service that allows an attacker to circumvent intended access controls. The vulnerability is network-reachable and requires no prior authentication or user interaction. An attacker who successfully exploits this authentication bypass can obtain command execution capabilities and interact with privileged functionality, leading to complete device compromise. Xiiaozet recommends updating to version 2.1.240 or later.

## Affected products

- Xiiaozet LK100W <2.1.240

## Timeline

- 2026-08-27: disclosed
- 2026-08-28: advisory

## References

- [https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-239-01.json](https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-239-01.json)
- [https://www.cisa.gov/news-events/ics-advisories/icsa-26-239-01](https://www.cisa.gov/news-events/ics-advisories/icsa-26-239-01)

## Related threats

- [Xiiaozet LK100W missing authentication in critical management function](https://junglewise.ai/threats/cve-2026-78239-xiiaozet-lk100w-missing-authentication-in-critical-management)
- [Xiiaozet LK100W OS command injection in web management interface](https://junglewise.ai/threats/cve-2026-78037-xiiaozet-lk100w-os-command-injection-in-web-management-interface)