{"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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "penpot", "vendor": "penpot", "versions": [{"lessThan": "2.18.0", "status": "affected", "version": "0", "versionType": "semver"}]}, {"collectionURL": "https://www.npmjs.com", "defaultStatus": "unaffected", "packageName": "@penpot/mcp", "packageURL": "pkg:npm/%40penpot/mcp", "product": "@penpot/mcp", "vendor": "penpot", "versions": [{"lessThanOrEqual": "2.15.4", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "[email protected]"}], "cveTags": [], "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."}], "id": "CVE-2026-100868", "lastModified": "2026-09-27T13:16:37.960", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "LOW", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.4, "source": "[email protected]", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "ADJACENT", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "[email protected]", "type": "Secondary"}]}, "published": "2026-09-27T13:16:37.960", "references": [{"source": "[email protected]", "url": "https://github.com/penpot/penpot"}, {"source": "[email protected]", "url": "https://github.com/penpot/penpot/blob/1d2c37e52c733f74017d90b0fd1ae2d074a5c33d/mcp/packages/server/src/PluginBridge.ts#L52"}, {"source": "[email protected]", "url": "https://github.com/penpot/penpot/commit/b5274a44766d095247037be18c1d1918ac67ddeb"}, {"source": "[email protected]", "url": "https://github.com/penpot/penpot/security/advisories/GHSA-22qr-rp27-j9wm"}, {"source": "[email protected]", "url": "https://github.com/penpot/penpot/security/advisories/GHSA-ch2q-6x56-qg5r"}, {"source": "[email protected]", "url": "https://www.vulncheck.com/advisories/penpot-before-2.18.0-unauthenticated-websocket-access-via-mcp-bridge"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1327"}], "source": "[email protected]", "type": "Primary"}]}

{}

{}