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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (42.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Icewhaletech Zimaos — versions < 1.5.3
- Zimaspace Zimaos
Weakness classification (CWE)
References
- github.com/IceWhaleTech/ZimaOS/security/advisories/GHSA-vqqj-f979-8c8m (Exploit, Vendor Advisory)
- github.com/IceWhaleTech/ZimaOS/releases/tag/1.5.3 (Product, 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.