GHSA-fwf6-j56g-m97c

Suggest an improvement
Source
https://github.com/advisories/GHSA-fwf6-j56g-m97c
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-fwf6-j56g-m97c/GHSA-fwf6-j56g-m97c.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-fwf6-j56g-m97c
Aliases
Published
2026-05-08T18:35:17Z
Modified
2026-05-08T18:56:25Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Electerm has an unvalidated shell.openExternal that allows arbitrary protocol execution via terminal link click
Details

Impact

Electerm's terminal hyperlink handler passes any URL clicked in the terminal directly to shell.openExternal without any protocol validation.

When a user connects to a malicious SSH server, the attacker can print a crafted URI in the terminal output. If the victim clicks the link, shell.openExternal executes it using the operating system's default protocol handler.

This can be abused to:

  • Trigger dangerous protocol handlers (ms-msdt:, search-ms:) for code execution
  • Open local files or network shares (file://, UNC paths) to leak NTLM hashes or exfiltrate data
  • Launch any installed application associated with a custom URI scheme

An attacker who controls terminal output (e.g., via a malicious SSH server, compromised remote host, or malicious plugin rendering terminal content) can thus achieve arbitrary code execution or local file access on the victim's machine, requiring only that the victim clicks a displayed link.

Patches

As of electerm v3.7.9, no official patch has been released. Users should monitor the project’s GitHub releases and security page for an update addressing this issue.

Workarounds

Until a patch is available:

  • Do not click on any links displayed in terminal sessions connected to untrusted servers.
  • If possible, disable hyperlink rendering in electerm's terminal settings.
  • Use a terminal multiplexer (e.g., tmux) or a separate terminal application that filters URI schemes when working with untrusted hosts.
  • Consider running electerm in a restricted environment (sandbox, AppArmor, SELinux) that limits the spawning of protocol handlers.

Resources

Database specific 
{
    "cwe_ids":  [
        "CWE-601",
        "CWE-88"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-05-08T18:35:17Z",
    "nvd_published_at":  "2026-05-08T04:16:23Z",
    "severity":  "HIGH"
}
References

Affected packages

npm / electerm

Package

Name
electerm
View open source insights on deps.dev
Purl
pkg:npm/electerm

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Last Affected
3.8.15

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-fwf6-j56g-m97c/GHSA-fwf6-j56g-m97c.json"