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Advisories

Penpot before 2.18.0 Unauthenticated WebSocket Access via MCP Bridge

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severity
medium
date
Affecting

  • penpot >= 0, < 2.18.0

  • @penpot/mcp <= 2.15.4

CWE
  • CWE-1327 Binding to an Unrestricted IP Address
CVSS
5.3
CVSS V4 Vector
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Credit
George Chen
Description
Penpot before 2.18.0 binds the MCP server plugin WebSocket bridge to all network interfaces without authentication in single-user mode. Unauthenticated attackers on adjacent networks can connect to the WebSocket port to impersonate the Penpot browser plugin, intercept task payloads, and return forged results to the MCP client.

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