{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-100868","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-09-27T00:20:54.407Z","datePublished":"2026-09-27T13:09:53.387Z","dateUpdated":"2026-09-27T13:09:53.387Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-09-27T13:09:53.387Z"},"datePublic":"2026-09-22T00:00:00.000Z","title":"Penpot before 2.18.0 Unauthenticated WebSocket Access via MCP Bridge","descriptions":[{"lang":"en","value":"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."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Binding to an Unrestricted IP Address","cweId":"CWE-1327","type":"CWE"}]}],"affected":[{"vendor":"penpot","product":"penpot","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"2.18.0"}]},{"vendor":"penpot","product":"@penpot/mcp","collectionURL":"https://www.npmjs.com","packageName":"@penpot/mcp","packageURL":"pkg:npm/%40penpot/mcp","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","versionType":"semver","lessThanOrEqual":"2.15.4"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:kaleidos:penpot:*:*:*:*:*:*:*:*","versionEndExcluding":"2.18.0"}]}]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"ADJACENT","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"LOW","baseScore":6.3,"baseSeverity":"MEDIUM"}}],"references":[{"url":"https://github.com/penpot/penpot/security/advisories/GHSA-ch2q-6x56-qg5r","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-ch2q-6x56-qg5r)"},{"url":"https://github.com/penpot/penpot/commit/b5274a44766d095247037be18c1d1918ac67ddeb","tags":["patch"]},{"url":"https://github.com/penpot/penpot/blob/1d2c37e52c733f74017d90b0fd1ae2d074a5c33d/mcp/packages/server/src/PluginBridge.ts#L52","tags":["technical-description"]},{"url":"https://github.com/penpot/penpot/security/advisories/GHSA-22qr-rp27-j9wm","tags":["related","vendor-advisory"],"name":"GitHub Security Advisory (GHSA-22qr-rp27-j9wm)"},{"url":"https://github.com/penpot/penpot","tags":["product"]},{"name":"VulnCheck Advisory: Penpot before 2.18.0 Unauthenticated WebSocket Access via MCP Bridge","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/penpot-before-2.18.0-unauthenticated-websocket-access-via-mcp-bridge"}],"credits":[{"lang":"en","value":"George Chen","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}}}}