Is CVE-2026-28798 actively exploited?

No active exploitation of CVE-2026-28798 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-28798 be exploited remotely?

Yes. CVE-2026-28798 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-28798?

CVE-2026-28798 has a CVSS score of 9.0 (CRITICAL).

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CRITICAL

CVE-2026-28798

CWE-918Published: April 3, 2026· Updated: Apr 7, 2026

9.0

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.6th

Official 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.

NVD Source

Risk Analysis

This critical vulnerability in ZimaOS allows unauthenticated attackers to access internal localhost services when the product is exposed via a Cloudflare Tunnel. A proxy endpoint can be abused to make requests to internal-only endpoints, leading to unauthorized access to sensitive local services. With a CVSS score of 9.0, this vulnerability poses a high risk of internal network compromise.

No public exploit is currently known for this vulnerability. Its remote exploitability, while requiring a specific configuration (Cloudflare Tunnel), makes it a significant concern for exposed instances.

Recommended Action

Administrators should upgrade ZimaOS to version 1.5.3 or later to patch this proxy endpoint vulnerability. Ensure that internal services are not inadvertently exposed to the internet through misconfigured proxies or tunnels.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-28798 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.0.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.