CVE-2026-28798
Critical
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.
SeverityCritical
CVSS9.0
Exploit probability—
ProductZimaspace Zimaos
PublishedApr 3, 2026
First seenApr 3, 2026
Weakness typeCWE-918Server-side request forgery (SSRF)
How to fix
Update
- zimaspace zimaos1.5.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| zimaspace zimaos | v < 1.5.3 | 1.5.3 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.