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TI-2026-65006 Aliases CVE-2026-100868GHSA-hm3w-7xgf-hfwf

Penpot before 2.18.0 Unauthenticated WebSocket Access via MCP Bridge

Priority MEDIUM 57CWE-1327Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00535 45th percentileScored 2026-11-07
Fix Fixed penpot (penpot): 2.18.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
penpotpenpotbefore 2.18.02.18.0Patch availableCNA
penpot@penpot/mcpup to 2.15.4—No fix listedCNA
  • penpot Vendorpenpot Affected before 2.18.0 Fixed in 2.18.0 Patch available CNA
  • @penpot/mcp Vendorpenpot Affected up to 2.15.4 Fixed in — No fix listed CNA

Remediation

  • Fix · CNA penpot (penpot) Fixed in 2.18.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-100868
  2. 2026-10-03 Alias added: GHSA-hm3w-7xgf-hfwf

References

Patch 1

Advisory 2

Other 2

  • TI-2026-68335 OS command injection in Penpot SVG exporter via fill color CVSS 3.1CRITICAL 9.9
  • TI-2026-32845 Penpot: Pre-authenticated account takeover via team-invitation token + prepare-register-profile CVSS 3.1CRITICAL 9.9
  • TI-2026-35172 Penpot: Stored XSS via comment content, innerHTML renders unsanitized HTML CVSS 3.1HIGH 8.7
  • TI-2026-33540 Penpot: MCP REPL server binds to 0.0.0.0 with unauthenticated /execute endpoint — RCE CVSS 3.1HIGH 8.8
  • TI-2026-14441 Missing authorization in Penpot CVSS 3.1HIGH 7.5
  • TI-2026-33541 Penpot: Authenticated SSRF in remote image import via create-file-media-object-from-url CVSS 3.1HIGH 7.7
See all 18 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences