---
id: CVE-2026-28798
title: >-
  ZimaOS is a fork of CasaOS, an operating system for Zima devices and x86-64
  systems with UEFI
summary: >-
  ZimaOS is a fork of CasaOS, an operating system for Zima devices and x86-64
  systems with UEFI. Prior to version 1.5.3, a proxy endpoint (/v1/sys/proxy)
  exposed by ZimaOS's web interface can be abused (via an externally reachable
  domain u…
severity: critical
cvss: 9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-918
vendor: zimaspace
product: zimaos
affected:
  - zimaos < 1.5.3
patched:
  - zimaos 1.5.3
published: '2026-04-03'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-28798'
references:
  - url: 'https://github.com/IceWhaleTech/ZimaOS/releases/tag/1.5.3'
    label: security-advisories@github.com
  - url: >-
      https://github.com/IceWhaleTech/ZimaOS/security/advisories/GHSA-vqqj-f979-8c8m
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00533
epssPercentile: 0.42586
ingestedAt: '2026-07-25T22:05:04.529Z'
---

## Overview

ZimaOS is a fork of CasaOS, an operating system for Zima devices and x86-64 systems with UEFI. Prior to version 1.5.3, a proxy endpoint (/v1/sys/proxy) exposed by ZimaOS's web interface can be abused (via an externally reachable domain using a Cloudflare Tunnel) to make requests to internal localhost services. This results in unauthenticated access to internal-only endpoints and sensitive local services when the product is reachable from the Internet through a Cloudflare Tunnel. This issue has been patched in version 1.5.3.

## Affected

- `zimaos < 1.5.3`

## Remediation

Upgrade past the affected range:

- `zimaos 1.5.3`