{"id":"CVE-2026-100868","published":"2026-09-27T13:16:37.960","lastModified":"2026-09-28T16:17:11.317","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.","cvssScore":6.3,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","cwes":["CWE-1327"],"vendors":[],"products":[],"references":[{"url":"https://github.com/penpot/penpot","tags":[]},{"url":"https://github.com/penpot/penpot/blob/1d2c37e52c733f74017d90b0fd1ae2d074a5c33d/mcp/packages/server/src/PluginBridge.ts#L52","tags":[]},{"url":"https://github.com/penpot/penpot/commit/b5274a44766d095247037be18c1d1918ac67ddeb","tags":[]},{"url":"https://github.com/penpot/penpot/security/advisories/GHSA-22qr-rp27-j9wm","tags":[]},{"url":"https://github.com/penpot/penpot/security/advisories/GHSA-ch2q-6x56-qg5r","tags":[]},{"url":"https://www.vulncheck.com/advisories/penpot-before-2.18.0-unauthenticated-websocket-access-via-mcp-bridge","tags":[]},{"url":"https://github.com/penpot/penpot/security/advisories/GHSA-ch2q-6x56-qg5r","tags":[]}],"exploitRefs":[{"url":"https://github.com/penpot/penpot","tags":[]},{"url":"https://github.com/penpot/penpot/blob/1d2c37e52c733f74017d90b0fd1ae2d074a5c33d/mcp/packages/server/src/PluginBridge.ts#L52","tags":[]},{"url":"https://github.com/penpot/penpot/commit/b5274a44766d095247037be18c1d1918ac67ddeb","tags":[]},{"url":"https://github.com/penpot/penpot/security/advisories/GHSA-22qr-rp27-j9wm","tags":[]},{"url":"https://github.com/penpot/penpot/security/advisories/GHSA-ch2q-6x56-qg5r","tags":[]},{"url":"https://github.com/penpot/penpot/security/advisories/GHSA-ch2q-6x56-qg5r","tags":[]}],"hasPoc":true,"ai":null}