CVE-2026-50733

{"id": "CVE-2026-50733", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-50733", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-06-05T19:03:16.138729Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}], "cvssMetricV40": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.6, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "ACTIVE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "disclosure@vulncheck.com", "affectedData": [{"vendor": "shd101wyy", "product": "Markdown Preview Enhanced", "versions": [{"status": "affected", "version": "0", "lessThan": "0.8.28", "versionType": "semver"}]}]}], "published": "2026-06-05T18:17:34.050", "references": [{"url": "https://github.com/shd101wyy/vscode-markdown-preview-enhanced/issues/2315", "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.28", "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/markdown-preview-enhanced-arbitrary-code-execution-via-wavedrom-eval", "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/shd101wyy/vscode-markdown-preview-enhanced/issues/2315", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-95"}]}], "descriptions": [{"lang": "en", "value": "Markdown Preview Enhanced before 0.8.28 parses WaveDrom diagrams by evaluating untrusted markdown content with eval(), allowing arbitrary JavaScript execution. The flaw affects every render path - the live preview (window.eval) and presentation mode plus HTML export (the bundled WaveDrom.ProcessAll()/eva() helpers) - and can also be triggered through a <script type=\"WaveDrom\"> element injected via raw HTML in markdown. When a victim previews or exports a crafted markdown document, an attacker can execute arbitrary code, leading to arbitrary file write. Fixed in 0.8.28 by parsing with JSON5.parse() and sanitizing WaveDrom data scripts to inert strict JSON."}, {"lang": "es", "value": "Markdown Preview Enhanced anterior a la versi\u00f3n 0.8.28 analiza diagramas WaveDrom al evaluar contenido markdown no confiable con eval(), lo que permite la ejecuci\u00f3n arbitraria de JavaScript. La vulnerabilidad afecta a cada ruta de renderizado - la vista previa en vivo (window.eval) y el modo de presentaci\u00f3n m\u00e1s la exportaci\u00f3n HTML (los ayudantes WaveDrom.ProcessAll()/eva() incluidos) - y tambi\u00e9n puede activarse a trav\u00e9s de un elemento [script_tag] inyectado mediante HTML sin procesar en markdown. Cuando una v\u00edctima previsualiza o exporta un documento markdown manipulado, un atacante puede ejecutar c\u00f3digo arbitrario, lo que lleva a la escritura arbitraria de archivos. Solucionado en la versi\u00f3n 0.8.28 al analizar con JSON5.parse() y sanear los scripts de datos de WaveDrom a JSON estricto inerte."}], "lastModified": "2026-10-26T11:10:00.157", "sourceIdentifier": "disclosure@vulncheck.com"}