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CVE-2026-28798— Arbitrary internal service access via /v1/sys/proxy when Cloudflare Tunnel is enabled on ZimaOS

Quick assessment

Affected
IceWhaleTech ZimaOS
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ZimaOS是IceWhaleTech的一个开源的操作系统项目，旨在提供一个轻量级、高性能、安全的操作系统环境。 ZimaOS 1.5.3之前版本存在代码问题漏洞，该漏洞源于Web界面暴露的代理端点可能被滥用，向内部本地主机服务发起请求，可能导致当产品通过Cloudflare Tunnel可从互联网访问时，未经验证即可访问内部端点和敏感本地服务。

CVSS 9.1 · Critical EPSS 0.53% · P43
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I. Basic Information for CVE-2026-28798

Vulnerability Information
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Vulnerability Title
Arbitrary internal service access via /v1/sys/proxy when Cloudflare Tunnel is enabled on ZimaOS
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
ZimaOS 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ZimaOS是IceWhaleTech的一个开源的操作系统项目，旨在提供一个轻量级、高性能、安全的操作系统环境。 ZimaOS 1.5.3之前版本存在代码问题漏洞，该漏洞源于Web界面暴露的代理端点可能被滥用，向内部本地主机服务发起请求，可能导致当产品通过Cloudflare Tunnel可从互联网访问时，未经验证即可访问内部端点和敏感本地服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
IceWhaleTech ZimaOS < 1.5.3 -

II. Public POCs for CVE-2026-28798

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8992 chars
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III. Intelligence Information for CVE-2026-28798

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Vendor Advisories for CVE-2026-28798 (1)

IV. Related Vulnerabilities

Same product: ZimaOS
Same vendor: IceWhaleTech
Same weakness: CWE-918

V. Comments for CVE-2026-28798

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