---
id: CVE-2026-112161
title: Lack of integrity checks in Mobatek’s MobaXterm
summary: >-
  MobaXterm Personal Edition (Portable) 26.4 GA extracts the CygUtils64.plugin
  file without first verifying its integrity. A local attacker with write
  permissions on this file can replace the ‘bin/cygwin1.dll’ library contained
  within it w…
severity: high
cvss: 8.5
cvssVector: 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-345
vendor: Mobatek
product: MobaXterm
affected:
  - MobaXterm 26.4 GA
published: '2026-10-19'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:19:20.794Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-112161'
references:
  - url: >-
      https://www.incibe.es/en/incibe-cert/notices/aviso/lack-integrity-checks-mobateks-mobaxterm
tags:
  - cve.org
ingestedAt: '2026-10-19T10:20:54.945Z'
---

## Overview

MobaXterm Personal Edition (Portable) 26.4 GA extracts the CygUtils64.plugin file without first verifying its integrity. A local attacker with write permissions on this file can replace the ‘bin/cygwin1.dll’ library contained within it with a malicious library. When the victim opens a Local Shell session or uses a Cygwin-based function, the application extracts the component and loads the tampered library, executing code with the victim’s permissions. Exploitation requires write access to the plugin and does not, in itself, involve privilege escalation.

## Affected

- `MobaXterm 26.4 GA`

## Remediation

Update MobaXterm to version 26.5, released on 11 September 2026, or to a later version.