PatchTheCVECVE-2026-28798: ZimaOS is a fork of CasaOS, an operating system for Zima devices and x86-64 systems with UEFI
CVE-2026-28798 is a critical-severity flaw (CVSS 9.0) affecting zimaos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 Inte
Why this priority
- Critical severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.0 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 67%) |
| CISA exploited list | No |
| Weakness | CWE-918 |
| Published | 2026-04-03 |
| Last modified | 2026-07-24 |
Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-28798?
zimaos: upgrade to 1.5.3. Exact commands for each OS are on this page.
Is CVE-2026-28798 being exploited?
CVE-2026-28798 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-28798 affect?
CVE-2026-28798 affects zimaos. Severity is critical (CVSS 9.0). 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 usin
How urgent is CVE-2026-28798?
Priority 50/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action
Software pages
Related CVEs
- CVE-2026-28442 HIGH 8.5 MITIGATE ZimaOS is a fork of CasaOS, an operating system for Zima devices and x86-64 systems with UEFI
- CVE-2026-28286 HIGH 8.5 MITIGATE ZimaOS is a fork of CasaOS, an operating system for Zima devices and x86-64 systems with UEFI
- CVE-2025-64427 HIGH 7.1 UPGRADE ZimaOS is a fork of CasaOS, an operating system for Zima devices and x86-64 systems with UEFI