All vulnerabilities
CVE-2026-100868CVE-2026-45805GHSA-22qr-rp27-j9wmGHSA-ch2q-6x56-qg5r

Penpot before 2.18.0 Unauthenticated WebSocket Access via MCP Bridge

penpot penpotnpmLibraries & packages
Open in ThreatlineRecord JSON
CVSS
5.3Medium
ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 28 Sep 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.26%Chance of exploitation activity in the next 30 days, higher than 16% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in2.18.0Also 2.15.0CVE List
Published27 Sep 2026Updated 8 Oct 2026CVE List

What fixes it

  • 2.18.0penpotCVE List
  • 2.15.0@penpot/mcp, npmOSVnpm install @penpot/mcp@2.15.0

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 3

  • penpotaffected: all versions before 2.18.0CVE List
  • @penpot/mcpaffected: all versions through 2.15.4CVE List
  • @penpot/mcp, npmfrom first release, fixed in 2.15.0OSV

References 6