CVE-2026-28798
ZimaOS, an operating system for Zima devices, has a critical flaw that lets anyone on the internet use a Cloudflare Tunnel to access internal services through a proxy endpoint. The flaw allows unauthenticated attackers to read, modify, or disrupt sensitive local services. It was fixed in ZimaOS version 1.5.3.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
ZimaOS (zimaspace zimaos) versions earlier than 1.5.3.
Real-world impact
An attacker could use the exposed proxy to reach internal services, potentially reading sensitive data, modifying configurations, or causing denial of service.
Why this severity
The CVSS score of 9 reflects that the vulnerability is network‑reachable, requires no authentication, and gives attackers full control over confidentiality, integrity, and availability of internal services, with a scope change that can affect the entire system.
What to do about it
- 01Upgrade ZimaOS to version 1.5.3 or later.
- 02Restart the ZimaOS web interface service to apply the update.
NVD-referenced vendor advisory
Timeline
- Apr 3, 2026 · Apr 3, 2026PublishedDisclosed and added to the National Vulnerability Database.
- Jul 24, 2026 · 11d agoAdvisory updatedThe NVD record was last revised.
- Jul 26, 2026 · 10d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.
How it’s attacked
References & advisories
- github.com/IceWhaleTech/ZimaOS/release…productrelease notes
- github.com/IceWhaleTech/ZimaOS/securit…exploitvendor advisory