CVE-2026-78239Network attack vector

Unauthorized device access via unauthenticated service enablement

Published Aug 27, 2026 · Updated Aug 27, 2026

Missing authentication in Xiiaozet LK100W before 2.1.240 allows remote attackers to enable restricted administrative services. The exposed management function accepts an unauthenticated network request and enables services intended to remain restricted, but CISA does not identify the endpoint or request format. Network reachability to the device is sufficient; resulting service exposure permits unauthorized device access, while exact post-access actions remain undisclosed.

CVSS severity9.8
Critical
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Xiiaozet LK100W before 2.1.240 allows remote attackers to enable restricted administrative services. The exposed management function accepts an unauthenticated network request and enables services intended to remain restricted, but CISA does not identify the endpoint or request format. Network reachability to the device is sufficient; resulting service exposure permits unauthorized device access, while exact post-access actions remain undisclosed.

The record

CVE
CVE-2026-78239
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
Xiiaozet
Product
Xiiaozet LK100W
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.1.240

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Xiiaozet · Xiiaozet LK100Wversion=0 <2.1.240

Published CVSS scores

9.8CISACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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