TI-2026-04182 Aliases CVE-2026-4795 GHSA-2r2c-hg87-r54j

Missing authorization in Zyxel GS1200-5v3 firmware

LOW 28CWE-862Published 2026-05-26 · Updated 2026-05-26

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · None · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

A missing authorization vulnerability in Zyxel GS1200-5v3 firmware versions through 1.00(ACPS.2)C0, GS1200-8v3 firmware versions through 1.00(ACPT.2)C0, GS1200-5HPv3 firmware versions through 1.00(ACPU.2)C0, GS1200-8HPv3 firmware versions through 1.00(ACPV.2)C0, and GS1200-10v3 firmware versions through 1.00(ACPW.2)C0 could allow a LAN-based, unauthenticated attacker to read the system configuration from a log file via a crafted HTTP request.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00234 14th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Zyxel	GS1200-5v3 firmware	up to 1.00(ACPS.2)C0	—	No fix listed	CNA
Zyxel	GS1200-8v3 firmware	up to 1.00(ACPT.2)C0	—	No fix listed	CNA
Zyxel	GS1200-5HPv3 firmware	up to 1.00(ACPU.2)C0	—	No fix listed	CNA
Zyxel	GS1200-8HPv3 firmware	up to 1.00(ACPV.2)C0	—	No fix listed	CNA
Zyxel	GS1200-10v3 firmware	up to 1.00(ACPW.2)C0	—	No fix listed	CNA

GS1200-5v3 firmware VendorZyxel Affected up to 1.00(ACPS.2)C0 Fixed in — No fix listed CNA
GS1200-8v3 firmware VendorZyxel Affected up to 1.00(ACPT.2)C0 Fixed in — No fix listed CNA
GS1200-5HPv3 firmware VendorZyxel Affected up to 1.00(ACPU.2)C0 Fixed in — No fix listed CNA
GS1200-8HPv3 firmware VendorZyxel Affected up to 1.00(ACPV.2)C0 Fixed in — No fix listed CNA
GS1200-10v3 firmware VendorZyxel Affected up to 1.00(ACPW.2)C0 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-4795
2026-10-03 Alias added: GHSA-2r2c-hg87-r54j

References

Advisory 1

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-missing-authorization-vulnerability-in-gs1200v3-series-switches-05-26-2026

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TI-2023-16197 Buffer overflow in Zyxel ATP series firmware KEVCVSS 3.1CRITICAL 9.8
TI-2023-13281 OS command injection in Zyxel ZyWALL/USG series firmware KEVCVSS 3.1CRITICAL 9.8
TI-2023-12582 OS command injection in Zyxel NAS326 firmware KEVCVSS 3.1CRITICAL 9.8
TI-2022-12682 OS command injection in Zyxel USG FLEX 100 firmware KEVCVSS 3.1CRITICAL 9.8
TI-2020-17772 Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with… KEVCVSS 3.1CRITICAL 9.8

See all 340 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences