Medium severity6.3NVD Advisory· Published Sep 27, 2026
CVE-2026-100868
CVE-2026-100868
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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Affected products
1Patches
Vulnerability mechanics
References
5- github.com/penpot/penpot/blob/1d2c37e52c733f74017d90b0fd1ae2d074a5c33d/mcp/packages/server/src/PluginBridge.tsnvd
- github.com/penpot/penpot/commit/b5274a44766d095247037be18c1d1918ac67ddebnvd
- github.com/penpot/penpot/security/advisories/GHSA-22qr-rp27-j9wmnvd
- github.com/penpot/penpot/security/advisories/GHSA-ch2q-6x56-qg5rnvd
- www.vulncheck.com/advisories/penpot-before-2.18.0-unauthenticated-websocket-access-via-mcp-bridgenvd
News mentions
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