CVE-2026-25866
HIGHDescription
MobaXterm versions prior to 26.1 contain an uncontrolled search path element vulnerability. The application calls WinExec to execute Notepad++ without a fully qualified executable path when opening remote files. An attacker can exploit the search path behavior by placing a malicious executable earlier in the search order, resulting in arbitrary code execution in the context of the affected user.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 3% of all known CVEs.
References
Related Vulnerabilities
Other CWE-428 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2023-38408 | Critical | 9.8 | 80% | - | Fix |
| CVE-2020-15261 | High | 8.0 | 11% | - | Fix |
| CVE-2017-13993 | High | 7.8 | 2.6% | - | - |
| CVE-2018-10619 | High | 7.8 | 2.6% | - | Fix |
| CVE-2019-17658 | Critical | 9.8 | 2.2% | - | - |
| CVE-2015-4173 | Medium | 6.9 | 2.1% | - | Fix |
Common questions
How do I fix CVE-2026-25866?
Upgrade MobaXterm to 26.1 or later.
Is CVE-2026-25866 being actively exploited?
Not that we know of. CVE-2026-25866 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.13% is the estimated probability that it will be exploited in the next 30 days. That is higher than 3% of all scored CVEs.
How severe is CVE-2026-25866?
CVE-2026-25866 has a CVSS v3 base score of 7.8, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-25866 affect?
Published advisories record a fix for MobaXterm (Windows application). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-25866
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.