TI-2026-76286 Aliases CVE-2026-112161 GHSA-4hm2-976c-4pjq

Missing integrity check in Mobatek MobaXterm lets local users run code

LOW 37CWE-345Published 2026-10-19 · Updated 2026-10-20

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-345.

Summary

MobaXterm Personal Edition (Portable) from 26.4 GA extracts the CygUtils64.plugin file without verifying its integrity (CWE-345). A local attacker with write access to that plugin can replace the bin/cygwin1.dll library inside it with a malicious library. When the victim opens a Local Shell session or uses a Cygwin-based function, the tampered library loads and runs code with the victim's permissions.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00079 0th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Mobatek	MobaXterm	26.4 GA	—	No fix listed	CNA

MobaXterm VendorMobatek Affected 26.4 GA Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for MobaXterm.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

2026-10-19 Threatist record created from CVE-2026-112161
2026-10-19 Alias added: GHSA-4hm2-976c-4pjq
2026-10-19 Priority changed: MEDIUM → LOW
2026-10-20 CISA SSVC decision points changed

References

Other 1

https://www.incibe.es/en/incibe-cert/notices/aviso/lack-integrity-checks-mobateks-mobaxterm

TI-2019-15791 Mobatek MobaXterm 12.1 Buffer Overflow via Sessions File CVSS 4.0CRITICAL 9.3
TI-2022-17979 An access control issue in MobaXterm before v22.1 allows attackers to make connections to… CVSS 3.1HIGH 8.1
TI-2022-17980 When aborting a SFTP connection, MobaXterm before v22.1 sends a hardcoded password to the… CVSS 3.1CRITICAL 9.1
TI-2017-11289 The TELNET service in Mobatek MobaXterm 10.4 does not require authentication, which… CVSS 3.1CRITICAL 9.8
TI-2019-12274 In MobaXterm 11.1 and 12.1, the protocol handler is vulnerable to command injection. CVSS 3.1HIGH 8.8
TI-2019-05419 In MobaTek MobaXterm Personal Edition v11.1 Build 3860, the SSH private key and its… CVSS 3.0CRITICAL 9.8

See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences