What’s Vulnerable › Vulnerabilities

CVE-2026-78239: Xiiaozet LK100W Missing Authentication for Critical Function

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-08-31
• Weakness: CWE-306

Description

Xiiaozet LK100W exposes a critical management function that can be invoked without authentication, allowing a remote attacker to enable administrative services that should be restricted. Successful exploitation may permit unauthorized access to the device.

Affected products

• Xiiaozet LK100W: before 2.1.240 — fixed in 2.1.240

How to fix

Upgrade to a fixed version: Xiiaozet LK100W 2.1.240. Check the vendor advisory for mitigations.

References

• 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

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