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CVE-2026-11879: Arbitrary code execution in MobaXterm Personal Edition (Portable)

• Severity: high (CVSS 8.5 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-12 · updated 2026-10-26
• Weakness: CWE-427

Description

MobaXterm Personal Edition (Portable), in its 26.3 version (Build 5154), allows arbitrary code execution by loading malicious DLLs from a temporary directory that is predictable and can be modified by the user. During startup, the application searches for specific DLLs in this location before resorting to the system’s secure paths, enabling an attacker with local access to place a specially crafted DLL to be executed automatically when the victim launches the application.

Affected products

• Mobatek MobaXterm Personal Edition (Portable): 26.3

References

• https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-mobateks-mobaxterm-personal-edition-portable

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