CVE-2026-100868: penpot penpot

Penpot before 2.18.0 Unauthenticated WebSocket Access via MCP Bridge

CVSS 5.3 MediumEPSS 0.0053 · 45th percentile

Published by the CVE Program (CNA: VulnCheck) at 27 Sept 2026, 13:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
penpot	penpot pkg:npm/%40penpot/mcp	affected before 2.18.0 semver Other versions: unaffected
penpot	@penpot/mcp Package name: @penpot/mcp https://www.npmjs.com pkg:npm/%40penpot/mcp	affected 2.15.4 and earlier semver Other versions: unaffected

Identifiers

CVE-2026-100868

CNA

VulnCheck

Weakness (CWE)

CWE-1327

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
5.3	Medium	4.0	CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N	CNA (VulnCheck)Used for this record
6.3	Medium	3.1	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0053, the 45th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 27 Sept 2026. New records show when each source confirmed them.

Sources

References from the CNA

github.com/penpot/penpot/security/advisories/GHSA-ch2q-6x56-qg5r vendor-advisory
github.com/penpot/penpot/commit/b5274a44766d095247037be18c1d1918ac67ddeb patch
github.com/penpot/penpot/blob/1d2c37e52c733f74017d90b0fd1ae2d074a5c33d/mcp/packages/server/src/PluginBridge.ts#L52 technical-description
github.com/penpot/penpot/security/advisories/GHSA-22qr-rp27-j9wm relatedvendor-advisory
github.com/penpot/penpot product
www.vulncheck.com/advisories/penpot-before-2.18.0-unauthenticated-websocket-access-via-mcp-bridge third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.