CVE-2026-100868
MEDIUMCVSS 6.3Description
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.
Timeline
Published:September 27th, 2026 1:16 PM
Last modified:September 30th, 2026 5:32 PM
CVSS Scoring
CVSS v3: 6.3 (MEDIUM)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weaknesses (CWE)
References & Reports
Advisories, patches, and third-party reports
- https://github.com/penpot/penpot
- https://github.com/penpot/penpot/blob/1d2c37e52c733f74017d90b0fd1ae2d074a5c33d/mcp/packages/server/src/PluginBridge.ts#L52
- https://github.com/penpot/penpot/commit/b5274a44766d095247037be18c1d1918ac67ddeb
- https://github.com/penpot/penpot/security/advisories/GHSA-22qr-rp27-j9wm
- https://github.com/penpot/penpot/security/advisories/GHSA-ch2q-6x56-qg5r
- https://www.vulncheck.com/advisories/penpot-before-2.18.0-unauthenticated-websocket-access-via-mcp-bridge
- https://github.com/penpot/penpot/security/advisories/GHSA-ch2q-6x56-qg5r
Source: NIST NVD · Data may lag official sources by up to one minute