SSRF in Icewhaletech Zimaos
CVE-2026-28798
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
EPSS: 0.004 (31.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Icewhaletech Zimaos — versions < 1.5.3
- Zimaspace Zimaos
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-28798?
- CVE-2026-28798 is a critical-severity vulnerability in Icewhaletech Zimaos, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.0/10. Published 2026-04-03.
- How severe is CVE-2026-28798?
- Critical severity. CVSS v3 base score is 9.0 out of 10.