Path Traversal in Electerm
CVE-2026-43940
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (12.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.001
Affected products
- Electerm — versions < 3.7.16
- Electerm Project
Weakness classification (CWE)
References
- github.com/electerm/electerm/security/advisories/GHSA-f77v-9vpc-6pjm (Mitigation, Vendor Advisory)
- github.com/electerm/electerm/releases/tag/v3.7.16 (Release Notes)
Frequently asked questions
- What is CVE-2026-43940?
- CVE-2026-43940 is a high-severity vulnerability in Electerm, classified under Path Traversal. CVSS score: 8.4/10. Published 2026-05-08.
- How severe is CVE-2026-43940?
- High severity. CVSS v3 base score is 8.4 out of 10.