CVE-2026-33066

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{"affected": [{"affectedData": [{"product": "siyuan", "vendor": "siyuan-note", "versions": [{"status": "affected", "version": "< 3.6.1"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*", "matchCriteriaId": "E1AA6470-222A-4841-A487-DF65F9859780", "versionEndExcluding": "3.6.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "SiYuan is a personal knowledge management system. In versions 3.6.0 and below, the backend renderREADME function uses lute.New() without calling SetSanitize(true), allowing raw HTML embedded in Markdown to pass through unmodified. The frontend then assigns the rendered HTML to innerHTML without any additional sanitization. A malicious package author can embed arbitrary JavaScript in their README that executes when a user clicks to view the package details. Because SiYuan's Electron configuration enables nodeIntegration: true with contextIsolation: false, this XSS escalates directly to full Remote Code Execution. The issue was patched in version 3.6.1."}, {"lang": "es", "value": "SiYuan es un sistema de gesti\u00f3n de conocimiento personal. En las versiones 3.6.0 e inferiores, la funci\u00f3n renderREADME del backend utiliza lute.New() sin llamar a SetSanitize(true), lo que permite que el HTML sin procesar incrustado en Markdown pase sin modificar. El frontend luego asigna el HTML renderizado a innerHTML sin ninguna sanitizaci\u00f3n adicional. Un autor de paquete malicioso puede incrustar JavaScript arbitrario en su README que se ejecuta cuando un usuario hace clic para ver los detalles del paquete. Debido a que la configuraci\u00f3n de Electron de SiYuan habilita nodeIntegration: true con contextIsolation: false, este XSS escala directamente a la ejecuci\u00f3n remota de c\u00f3digo completa. El problema fue parcheado en la versi\u00f3n 3.6.1."}], "id": "CVE-2026-33066", "lastModified": "2026-06-17T10:36:53.573", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.0, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 6.0, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "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": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/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": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33066", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-20T21:22:54.684811Z", "version": "2.0.3"}}]}, "published": "2026-03-20T09:16:14.697", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/siyuan-note/siyuan/commit/b382f50e1880ed996364509de5a10a72d7409428"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4663-4mpg-879v"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.6.1)"}}], "enrichment": {"confidence": 84.0, "confidence_source": "matching", "scores": [{"score": 84.0, "source": "matching"}]}, "original": {"product": "siyuan", "source": "cna", "vendor": "siyuan-note"}, "product": "siyuan", "vendor": "siyuan"}], "analysis": {"en": {"generated_at": "2026-03-23T16:53:12.443523+00:00", "value": {"mitigation_remediation": ["Update SiYuan to version\u202f3.6.1 or later."], "summary": {"action": "Apply Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "The affected product is SiYuan by siyuan-note. All releases up to and including version 3.6.0 contain the vulnerability. The defect was addressed in version 3.6.1; users on that or later releases are no longer affected.", "description_and_impact": "SiYuan renders the README of a package without sanitizing raw Markdown, so an embedded script can survive into the webpage. When a user opens the package details, the frontend assigns this unfiltered HTML to innerHTML. Because the Electron process runs with nodeIntegration enabled and contextIsolation disabled, any script executed in the renderer gains full Node API access, allowing the attacker to execute arbitrary system commands. This stored cross\u2011site scripting flaw therefore escalates directly to remote code execution, undermining the confidentiality, integrity, and availability of the host machine.", "risk_and_exploitability": "The Common Vulnerability Scoring System assigns a score of 5.3, indicating a moderate severity level. The Exploit Prediction Scoring System rates the likelihood of exploitation below 1\u202f%, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Exploitation requires an attacker to supply a package containing a malicious README; the attack plays out when the victim opens the package details. If the user views the crafted content, the script runs with full system privileges, giving the attacker complete control of the victim's machine. The practical risk is therefore contingent upon users installing or opening untrusted packages, but the potential impact is high when the condition is met."}}}}, "created": "2026-03-20T10:36:39.902651+00:00", "updated": "2026-03-25T14:29:55.493134+00:00", "vendors": ["siyuan", "siyuan$PRODUCT$siyuan"]}