In MobaXterm 11.1 and 12.1, the protocol handler is vulnerable to command injection.

published 2019-09-14 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-7097

cvss: 8.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 6.7%; EPSS 6.7% chance of exploitation in 30 days, percentile 94%
public exploits: 0; none known

In MobaXterm 11.1 and 12.1, the protocol handler is vulnerable to command injection. A crafted link can trigger a popup asking whether the user wants to run MobaXterm to handle the link. If accepted, another popup appears asking for further confirmation. If this is also accepted, command execution is achieved, as demonstrated by the MobaXterm://`calc` URI.

Exploit prediction

6.74% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

freetom.github.io https://freetom.github.io/0day/2019/09/14/MobaXterm-command-exec-in-protocol-handler.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness

CWE-77 Improper Neutralization of Special Elements used in a Command

References

freetom.github.io /0day/2019/09/14/MobaXterm-command-exec-in-protocol-handler.html
exploit

Sources

CVE List CVE-2019-16305
NVD CVE-2019-16305

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary