electerm up to 3.7.15 ftp runWidget path traversal

Summaryinfo

A vulnerability identified as critical has been detected in electerm up to 3.7.15. This affects the function runWidget of the file terminal/ssh/sftp/telnet/serialport/RDP/VNC/Spice/ftp. Performing a manipulation results in path traversal. This vulnerability is reported as CVE-2026-43940. The attack requires a local approach. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in electerm up to 3.7.15. This affects the function runWidget of the file terminal/ssh/sftp/telnet/serialport/RDP/VNC/Spice/ftp. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

electerm is an open-sourced terminal/ssh/sftp/telnet/serialport/RDP/VNC/Spice/ftp client. Prior to version 3.7.16, the runWidget function in src/app/widgets/load-widget.js constructs a file path by directly concatenating user‑supplied widget identifiers without any sanitisation. Because runWidget is exposed to the renderer process via an asynchronous IPC handler with no input validation, an attacker who achieves JavaScript execution inside the renderer (for example, through a malicious plugin or a cross‑site scripting flaw in the built‑in webview) can abuse a path traversal (../) to load and execute an arbitrary JavaScript file anywhere on the victim’s filesystem. This gives the attacker local code execution with the full privileges of the electerm process, leading to complete system compromise. This issue has been patched in version 3.7.16.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-43940 since 05/04/2026. The exploitability is told to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 3.7.16 eliminates this vulnerability.

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Productinfo

Name

• electerm

Version

• 3.7.0
• 3.7.1
• 3.7.2
• 3.7.3
• 3.7.4
• 3.7.5
• 3.7.6
• 3.7.7
• 3.7.8
• 3.7.9
• 3.7.10
• 3.7.11
• 3.7.12
• 3.7.13
• 3.7.14
• 3.7.15

Website

• Product: https://github.com/electerm/electerm/

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