CVE-2026-4795

Configuration disclosure via unauthorized log-file request

Published May 26, 2026 · Updated May 26, 2026

Missing authorization in Zyxel GS1200v3 firmware allows remote attackers on the LAN to read system configuration via a crafted HTTP request. The responsible HTTP handler returns a log file containing the system configuration without an authorization check; Zyxel has not identified the endpoint. No credentials or user interaction are required, but the attacker must reach the same LAN, and the reported impact is limited to configuration disclosure.

CVSS severity6.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Zyxel GS1200v3 firmware allows remote attackers on the LAN to read system configuration via a crafted HTTP request. The responsible HTTP handler returns a log file containing the system configuration without an authorization check; Zyxel has not identified the endpoint. No credentials or user interaction are required, but the attacker must reach the same LAN, and the reported impact is limited to configuration disclosure.

The record

CVE
CVE-2026-4795
Published
May 26, 2026
Updated
May 26, 2026
Vendor
Zyxel Networks
Product
GS1200-8v3 firmware
Classifications
CWE-862, T1005
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 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=<= 1.00(ACPT.2)C0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Zyxel Networks · GS1200-8v3 firmwareversion=<= 1.00(ACPT.2)C0
Zyxel Networks · GS1200-10v3 firmwareversion=<= 1.00(ACPW.2)C0
Zyxel Networks · GS1200-5HPv3 firmwareversion=<= 1.00(ACPU.2)C0
Zyxel Networks · GS1200-8HPv3 firmwareversion=<= 1.00(ACPV.2)C0
Zyxel Networks · GS1200-5v3 firmwareversion=<= 1.00(ACPS.2)C0

Published CVSS scores

6.5Zyxel CorporationCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1005Data from Local System

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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