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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
penpot penpot
Default version status: unaffected
0 to < 2.18.0affected
pkg:npm/%40penpot/mcppenpot @penpot/mcp
Default version status: unaffected
0 to ≤ 2.15.4affected
pkg:npm/%40penpot/mcpReferences
- https://github.com/penpot/penpot/security/advisories/GHSA-ch2q-6x56-qg5r ↗
- https://github.com/penpot/penpot/commit/b5274a44766d095247037be18c1d1918ac67ddeb ↗
- https://github.com/penpot/penpot/blob/1d2c37e52c733f74017d90b0fd1ae2d074a5c33d/mcp/packages/server/src/PluginBridge.ts#L52 ↗
- https://github.com/penpot/penpot/security/advisories/GHSA-22qr-rp27-j9wm ↗
- https://github.com/penpot/penpot ↗
- https://www.vulncheck.com/advisories/penpot-before-2.18.0-unauthenticated-websocket-access-via-mcp-bridge ↗