CVE-2026-34605

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{"affected": [{"affectedData": [{"product": "siyuan", "vendor": "siyuan-note", "versions": [{"status": "affected", "version": ">= 3.6.0, < 3.6.2"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*", "matchCriteriaId": "74DCC4D9-9D0B-4E47-8DB2-2CEF6E189B47", "versionEndExcluding": "3.6.2", "versionStartIncluding": "3.6.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "SiYuan is a personal knowledge management system. From version 3.6.0 to before version 3.6.2, the SanitizeSVG function introduced in version 3.6.0 to fix XSS in the unauthenticated /api/icon/getDynamicIcon endpoint can be bypassed by using namespace-prefixed element names such as <x:script xmlns:x=\"http://www.w3.org/2000/svg\">. The Go HTML5 parser records the element's tag as \"x:script\" rather than \"script\", so the tag check passes it through. The SVG is served with Content-Type: image/svg+xml and no Content Security Policy; when a browser opens the response directly, its XML parser resolves the prefix to the SVG namespace and executes the embedded script. This issue has been patched in version 3.6.2."}, {"lang": "es", "value": "SiYuan es un sistema de gesti\u00f3n de conocimiento personal. Desde la versi\u00f3n 3.6.0 hasta antes de la versi\u00f3n 3.6.2, la funci\u00f3n SanitizeSVG introducida en la versi\u00f3n 3.6.0 para corregir XSS en el endpoint no autenticado /API/icon/getDynamicIcon puede ser eludida mediante el uso de nombres de elementos con prefijo de espacio de nombres como . El analizador HTML5 de Go registra la etiqueta del elemento como 'x:script' en lugar de 'script', por lo que la verificaci\u00f3n de la etiqueta lo permite pasar. El SVG se sirve con Content-Type: image/svg+xml y sin Pol\u00edtica de Seguridad de Contenido; cuando un navegador abre la respuesta directamente, su analizador XML resuelve el prefijo al espacio de nombres SVG y ejecuta el script incrustado. Este problema ha sido parcheado en la versi\u00f3n 3.6.2."}], "id": "CVE-2026-34605", "lastModified": "2026-06-17T10:39:18.647", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "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": 8.6, "baseSeverity": "HIGH", "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": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/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": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-34605", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-04-01T18:57:28.582022Z", "version": "2.0.3"}}]}, "published": "2026-03-31T22:16:22.253", "references": [{"source": "security-advisories@github.com", "tags": ["Issue Tracking"], "url": "https://github.com/siyuan-note/siyuan/issues/17246"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-73g7-86qr-jrg3"}], "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": "[3.6.0,3.6.2)"}}], "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": "2026-04-03T19:23:53.964947+00:00", "value": {"mitigation_remediation": ["Upgrade Siyuan to version 3.6.2 or later."], "summary": {"action": "Patch", "impact": "Cross\u2011Site Scripting via SVG endpoint"}, "threat_synthesis": {"affected_systems": "Siyuan Note versions 3.6.0 through 3.6.1 are affected; version 3.6.2 and later contain the patch that removes the vulnerable path.", "description_and_impact": "The SanitizeSVG function introduced in version 3.6.0 of the personal knowledge management system was designed to block disallowed SVG elements when an unprivileged user requested icons from /api/icon/getDynamicIcon. Between versions 3.6.0 and just before 3.6.2 the sanitiser failed to recognise elements whose tag names were prefixed with a namespace, such as <x:script xmlns:x=\"http://www.w3.org/2000/svg\">. The Go HTML5 parser records the tag as \"x:script\" and the sanitiser compares it only against the exact string \"script\", allowing the element to pass through. The resulting SVG is served with the content type image/svg+xml and no Content\u2011Security\u2011Policy. When a browser loads the response directly, it resolves the prefix to the SVG namespace and executes the embedded script, enabling an attacker to run arbitrary JavaScript in the context of any user who opens the returned SVG.", "risk_and_exploitability": "The CVSS base score of 8.6 signals high severity. With an EPSS score of 1\u202f% the likelihood of exploitation is low at present, and the vulnerability is not listed in the CISA KEV catalog. Attackers can exploit it by making a direct request to the public endpoint, receiving the malicious SVG, and causing a user agent to parse it, which would execute arbitrary client\u2011side code with the privileges of the viewing user."}}}}, "created": "2026-04-02T07:52:00.753760+00:00", "updated": "2026-04-03T21:17:24.007284+00:00", "vendors": ["siyuan", "siyuan$PRODUCT$siyuan"]}