Critical
SiYuan has a SanitizeSVG bypass via data:text/xml in getDynamicIcon (incomplete fix for CVE-2026-29183)
Type: advisorySources: OSV
SiYuan is a personal knowledge management system. In versions 3.6.0 and below, SanitizeSVG has an incomplete blocklist — it blocks data:text/html and data:image/svg+xml in href attributes but misses data:text/xml and data:application/xml, both of which can render SVG with JavaScript execution. The unauthenticated /api/icon/getDynamicIcon endpoint serves user-controlled input (via the content parameter) directly into SVG markup using fmt.Sprintf with no escaping, served as Content-Type: image/svg+xml. This creates a click-through XSS: a victim navigates to a crafted URL, sees an SVG with an injected link, and clicking it triggers JavaScript via the bypassed MIME types. The attack requires direct navigation to the endpoint or / embedding, since tag rendering in the frontend doesn't allow interactive links. This issue has been fixed in version 3.6.1.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-32940
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 02:13 UTC · Revision 1
Source evidence
SiYuan has a SanitizeSVG bypass via data:text/xml in getDynamicIcon (incomplete fix for CVE-2026-29183)
core-osv · Original sourcePublished 20 Mar 2026, 03:33 UTC
SiYuan is a personal knowledge management system. In versions 3.6.0 and below, SanitizeSVG has an incomplete blocklist — it blocks data:text/html and data:image/svg+xml in href attributes but misses data:text/xml and data:application/xml, both of which can render SVG with JavaScript execution. The unauthenticated /api/icon/getDynamicIcon endpoint serves user-controlled input (via the content parameter) directly into SVG markup using fmt.Sprintf with no escaping, served as Content-Type: image/svg+xml. This creates a click-through XSS: a victim navigates to a crafted URL, sees an SVG with an injected link, and clicking it triggers JavaScript via the bypassed MIME types. The attack requires direct navigation to the endpoint or / embedding, since tag rendering in the frontend doesn't allow interactive links. This issue has been fixed in version 3.6.1.
osv:CVE-2026-32940
Complete source record
{
"id": "b467ca21e98aee00f32fe3fc73257b5d8f387017ff7bfcc0ea0209b715cabcab",
"url": "https://osv.dev/vulnerability/CVE-2026-32940",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "SiYuan has a SanitizeSVG bypass via data:text/xml in getDynamicIcon (incomplete fix for CVE-2026-29183)",
"summary": "SiYuan is a personal knowledge management system. In versions 3.6.0 and below, SanitizeSVG has an incomplete blocklist — it blocks data:text/html and data:image/svg+xml in href attributes but misses data:text/xml and data:application/xml, both of which can render SVG with JavaScript execution. The unauthenticated /api/icon/getDynamicIcon endpoint serves user-controlled input (via the content parameter) directly into SVG markup using fmt.Sprintf with no escaping, served as Content-Type: image/svg+xml. This creates a click-through XSS: a victim navigates to a crafted URL, sees an SVG with an injected link, and clicking it triggers JavaScript via the bypassed MIME types. The attack requires direct navigation to the endpoint or / embedding, since tag rendering in the frontend doesn't allow interactive links. This issue has been fixed in version 3.6.1.",
"evidence": "osv:CVE-2026-32940",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2026-32940",
"aliases": [
"CVE-2026-32940",
"GHSA-4mx9-3c2h-hwhg",
"GO-2026-4721"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/siyuan-note/siyuan",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "fe4523fff2c84d6b06856331e735cc2938c2c5b0"
},
{
"fixed": "d01d561875d4f744e9f6232f1d4831e3642b8696"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "3.6.1"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "d01d561875d4f744e9f6232f1d4831e3642b8696"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "fe4523fff2c84d6b06856331e735cc2938c2c5b0"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v3.6.1"
}
]
}
}
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-32940.json"
}
}
],
"modified": "2026-10-28T02:30:25.379485544Z",
"provider": "osv",
"references": [
"https://github.com/siyuan-note/siyuan/releases/tag/v3.6.1",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32940.json",
"https://github.com/advisories/GHSA-6865-qjcf-286f",
"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4mx9-3c2h-hwhg",
"https://nvd.nist.gov/vuln/detail/CVE-2026-32940",
"https://github.com/siyuan-note/siyuan/commit/d01d561875d4f744e9f6232f1d4831e3642b8696"
],
"provider_metadata": {
"cwe_ids": [
"CWE-184",
"CWE-79"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32940.json"
}
},
"related_cves": [
{
"value": "CVE-2026-32940",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 491809,
"published_at": "2026-03-20T03:33:43.069+00:00"
}