CVE-2026-30281

CriticalPublic PoC

Published: 31 March 2026

Published

31 March 2026

Modified

06 April 2026

KEV Added

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Patch

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CVSS Score 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0012 31.0th percentile

Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-30281 is a critical-severity External Control of File Name or Path (CWE-73) vulnerability in Maru Neo.Maru. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 31.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 CM-5 (Access Restrictions for Change) and SI-10 (Information Input Validation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-10 Information Input Validation good match

prevent

Requires validation of file import inputs to prevent malicious paths or contents from overwriting critical internal files.

SI-2 Flaw Remediation good match

prevent

Mandates timely remediation of identified vulnerabilities like CVE-2026-30281 through patching the flawed file import process.

CM-5 Access Restrictions for Change good match

prevent

Restricts access and changes to critical system files, blocking unauthorized overwrites via the import mechanism.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1059 Command and Scripting Interpreter Execution

Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.

attack.mitre.org →

Why these techniques?

Remote unauthenticated arbitrary file overwrite in network-accessible file import directly enables T1190 (Exploit Public-Facing Application) for initial access and leads to arbitrary code execution via T1059 (Command and Scripting Interpreter).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

An arbitrary file overwrite vulnerability in MaruNuri LLC v2.0.23 allows attackers to overwrite critical internal files via the file import process, leading to arbitrary code execution or information exposure.

Deeper analysisAI

CVE-2026-30281 is an arbitrary file overwrite vulnerability (CWE-73) affecting MaruNuri LLC version 2.0.23. The flaw occurs in the file import process, enabling attackers to overwrite critical internal files. This can result in arbitrary code execution or information exposure, as indicated by the high CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). The vulnerability was published on 2026-03-31.

Remote, unauthenticated attackers can exploit this vulnerability over the network with low complexity and no user interaction required. By manipulating the file import mechanism, they can target and overwrite essential system files, achieving full control over the application. Potential outcomes include executing arbitrary code with the application's privileges or exposing sensitive data stored internally.

Mitigation details are referenced in advisories such as the GitHub issue at https://github.com/Secsys-FDU/AF_CVEs/issues/21, the vendor site at https://maru.xyz/, the Google Play Store listing at https://play.google.com/store/apps/details?id=neo.maru, and the Fudan University security page at https://secsys.fudan.edu.cn/. Security practitioners should consult these sources for patches or workarounds, as no specific remediation steps are detailed in the CVE description.