High
SiYuan: Stored XSS in imported .sy.zip content leads to arbitrary command execution
Type: advisorySources: OSV
SiYuan is a personal knowledge management system. Prior to version 3.6.2, a vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a malicious IAL value inside a .sy document, package it as a .sy.zip, and have the victim import it through the normal Import -> SiYuan .sy.zip workflow. Once the note is opened, the malicious attribute breaks out of its original HTML context and injects an event handler, resulting in stored XSS. In the Electron desktop client, this XSS reaches remote code execution because injected JavaScript runs with access to Node/Electron APIs. This issue has been patched in version 3.6.2.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-34585
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 16:35 UTC · Revision 1
Source evidence
SiYuan: Stored XSS in imported .sy.zip content leads to arbitrary command execution
core-osv · Original sourcePublished 31 Mar 2026, 21:47 UTC
SiYuan is a personal knowledge management system. Prior to version 3.6.2, a vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a malicious IAL value inside a .sy document, package it as a .sy.zip, and have the victim import it through the normal Import -> SiYuan .sy.zip workflow. Once the note is opened, the malicious attribute breaks out of its original HTML context and injects an event handler, resulting in stored XSS. In the Electron desktop client, this XSS reaches remote code execution because injected JavaScript runs with access to Node/Electron APIs. This issue has been patched in version 3.6.2.
osv:CVE-2026-34585
Complete source record
{
"id": "682ebbe8382374c76d63c74346d62781baed1753518a64f364d210266a6463fe",
"url": "https://osv.dev/vulnerability/CVE-2026-34585",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "SiYuan: Stored XSS in imported .sy.zip content leads to arbitrary command execution",
"summary": "SiYuan is a personal knowledge management system. Prior to version 3.6.2, a vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a malicious IAL value inside a .sy document, package it as a .sy.zip, and have the victim import it through the normal Import -> SiYuan .sy.zip workflow. Once the note is opened, the malicious attribute breaks out of its original HTML context and injects an event handler, resulting in stored XSS. In the Electron desktop client, this XSS reaches remote code execution because injected JavaScript runs with access to Node/Electron APIs. This issue has been patched in version 3.6.2.",
"evidence": "osv:CVE-2026-34585",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-34585",
"aliases": [
"CVE-2026-34585",
"GHSA-ff66-236v-p4fg",
"GO-2026-5357"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/siyuan-note/siyuan",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "29b104f338f9b0cdda0df852871a09a6268ced2f"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "3.6.2"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "29b104f338f9b0cdda0df852871a09a6268ced2f"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v3.6.2"
},
{
"cpe": "cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "3.6.2"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34585.json"
}
}
],
"modified": "2026-10-28T02:30:37.414700498Z",
"provider": "osv",
"references": [
"https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34585.json",
"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-ff66-236v-p4fg",
"https://nvd.nist.gov/vuln/detail/CVE-2026-34585",
"https://github.com/siyuan-note/siyuan/issues/17246"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79",
"CWE-94"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34585.json"
}
},
"related_cves": [
{
"value": "CVE-2026-34585",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 504765,
"published_at": "2026-03-31T21:47:01.843+00:00"
}