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CVE-2026-100868 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.3 MEDIUMVector:CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/penpot/penpot	[email protected]
https://github.com/penpot/penpot/blob/1d2c37e52c733f74017d90b0fd1ae2d074a5c33d/mcp/packages/server/src/PluginBridge.ts#L52	[email protected]
https://github.com/penpot/penpot/commit/b5274a44766d095247037be18c1d1918ac67ddeb	[email protected]
https://github.com/penpot/penpot/security/advisories/GHSA-22qr-rp27-j9wm	[email protected]
https://github.com/penpot/penpot/security/advisories/GHSA-ch2q-6x56-qg5r	[email protected]
https://www.vulncheck.com/advisories/penpot-before-2.18.0-unauthenticated-websocket-access-via-mcp-bridge	[email protected]

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1327	Binding to an Unrestricted IP Address	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

1 change record found show changes