What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-11 · updated 2026-09-09
• Weakness: CWE-913

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.

Affected products

• electerm: before 3.15.186

References

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

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