CVE-2026-43940

Code execution via traversed widget module path

Published May 8, 2026 · Updated May 8, 2026

Path traversal in electerm before 3.7.16 allows attackers with renderer JavaScript execution to run local code through a widget identifier. runWidget in src/app/widgets/load-widget.js concatenates that identifier into a module filename and passes the joined path to require without validation, allowing ../ segments to select any local JavaScript file. Reachability requires prior JavaScript execution in the renderer, such as through a malicious plugin or webview script, and the loaded file runs with the electerm process privileges.

CVSS severity8.4
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in electerm before 3.7.16 allows attackers with renderer JavaScript execution to run local code through a widget identifier. runWidget in src/app/widgets/load-widget.js concatenates that identifier into a module filename and passes the joined path to require without validation, allowing ../ segments to select any local JavaScript file. Reachability requires prior JavaScript execution in the renderer, such as through a malicious plugin or webview script, and the loaded file runs with the electerm process privileges.

The record

CVE
CVE-2026-43940
Published
May 8, 2026
Updated
May 8, 2026
Vendor
electerm
Product
electerm
Classifications
CWE-22, CWE-829, T1059.007
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.7.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

electerm · electermversion=< 3.7.16

Published CVSS scores

8.4GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-829Inclusion of Functionality from Untrusted Control Sphere
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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