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CVE-2026-76943 – Authentication Bypass Leading to Remote Command Execution – Xiiaozet LK100W Wireles

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Summary

CVE-2026-76943 is a critical authentication bypass vulnerability affecting the Xiiaozet LK100W wireless print server. An administrative service on the device contains an authentication weakness that allows a remote, unauthenticated attacker to bypass access controls and obtain command execution capabilities on the underlying device. The flaw carries a CVSS v3.1 base score of 9.8 (Critical) and can result in complete compromise of the affected print server.

Technical details

  • Root cause: CWE-288 (Authentication Bypass Using an Alternate Path or Channel) — an administrative service on the LK100W can be reached through a path that does not enforce the device’s intended authentication checks.
  • Trigger conditions: No valid credentials, prior authentication, or user interaction are required; the vulnerable service is reachable directly over the network.
  • Attack vector: Network (AV:N) — exploitable remotely against any exposed device without local access.
  • Impact: Successful exploitation allows an attacker to bypass access controls on the administrative interface and obtain command execution on the device, resulting in full loss of confidentiality, integrity, and availability of the print server.
  • This vulnerability was disclosed alongside two related flaws in the same advisory affecting the LK100W: CVE-2026-78239 (CWE-306, Missing Authentication, CVSS 9.8) and CVE-2026-78037 (CWE-78, OS Command Injection, CVSS 8.8, requires authentication).
  • No public exploitation of CVE-2026-76943 has been reported at the time of disclosure.

Affected software

  • Xiiaozet LK100W wireless print server — all versions prior to 2.1.240

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update the Xiiaozet LK100W firmware to version 2.1.240 or later, as recommended by the vendor.
  • If unable to patch immediately:
    • Restrict network exposure of the device’s administrative interface — do not expose the LK100W’s management service directly to the internet.
    • Place the device behind a firewall or on a segmented/isolated network accessible only to trusted administrators.
    • Monitor network traffic to the device’s management ports for unexpected or unauthorized access attempts.
    • Disable remote/WAN access to administrative functions where not strictly required.

References

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