What is the CVSS score of CVE-2026-28286?

CVE-2026-28286 has a CVSS 3.1 base score of 8.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Is there a public PoC exploit available for CVE-2026-28286?

Yes, a public proof-of-concept exploit is available for CVE-2026-28286. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-28286?

Within 24 hours: Immediately identify and inventory all systems running ZimaOS 1.5.2-beta3; restrict network access to affected devices and disable remote management capabilities. Within 7 days: Evaluate upgrade feasibility to patched versions when available; if unavailable, implement network segmentation to isolate affected systems from production infrastructure. Within 30 days: Complete migration away from 1.5.2-beta3 to a patched release; document all affected systems and remediation status; conduct security audit of affected systems for evidence of exploitation.

Zimaos CVE-2026-28286

HIGH

External Control of File Name or Path (CWE-73)

2026-03-02 security-advisories@github.com

Information Disclosure Zimaos Zimaspace

8.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

8.5 HIGH

AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Mar 05, 2026 - 15:16 vuln.today

Public exploit code

CVE Published

Mar 02, 2026 - 17:16 nvd

HIGH 8.5

DescriptionGitHub Advisory

ZimaOS is a fork of CasaOS, an operating system for Zima devices and x86-64 systems with UEFI. In version 1.5.2-beta3, the application enforces restrictions in the frontend/UI to prevent users from creating files or folders in internal OS paths. However, when interacting directly with the API, the restrictions are bypass-able. By sending a crafted request targeting paths like /etc, /usr, or other sensitive system directories, the API successfully creates files or directories in locations where normal users should have no write access. This indicates that the API does not properly validate the target path, allowing unauthorized operations on critical system directories. No known patch is publicly available.

AnalysisAI

ZimaOS 1.5.2-beta3 lacks proper path validation in its API, allowing authenticated users to bypass frontend restrictions and write files to protected system directories such as /etc and /usr. Public exploit code exists for this vulnerability, enabling attackers with valid credentials to modify critical OS files and potentially achieve code execution. No patch is currently available.

Technical ContextAI

Affects Zimaos. ZimaOS is a fork of CasaOS, an operating system for Zima devices and x86-64 systems with UEFI. In version 1.5.2-beta3, the application enforces restrictions in the frontend/UI to prevent users from creating files or folders in internal OS paths. However, when interacting directly with the API, the restrictions are bypass-able. By sending a crafted request targeting paths like /etc, /usr, or other sensitive system directories, the API successfully creates files or directories in locations where n