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: 9.1/10. Published 2026-04-03.

How severe is CVE-2026-28798?

Critical severity. CVSS v3 base score is 9.1 out of 10.

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 usi…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.001 (23.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (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

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

https://github.com/IceWhaleTech/ZimaOS/security/advisories/GHSA-vqqj-f979-8c8m (x_refsource_CONFIRM)
https://github.com/IceWhaleTech/ZimaOS/releases/tag/1.5.3 (x_refsource_MISC)

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: 9.1/10. Published 2026-04-03.
How severe is CVE-2026-28798?: Critical severity. CVSS v3 base score is 9.1 out of 10.