High
SiYuan before v3.8.2 Stored XSS via Asset Preview
Type: advisorySources: OSV
SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in the search asset preview feature that fails to escape indexed asset content before inserting it into the DOM using innerHTML. Attackers who can place crafted text assets in a workspace can execute JavaScript in the SiYuan origin when victims preview the assets, enabling authenticated API requests and workspace manipulation.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-87814
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 20:37 UTC · Revision 1
Source evidence
SiYuan before v3.8.2 Stored XSS via Asset Preview
core-osv · Original sourcePublished 9 Sept 2026, 11:21 UTC
SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in the search asset preview feature that fails to escape indexed asset content before inserting it into the DOM using innerHTML. Attackers who can place crafted text assets in a workspace can execute JavaScript in the SiYuan origin when victims preview the assets, enabling authenticated API requests and workspace manipulation.
osv:CVE-2026-87814
Complete source record
{
"id": "541214ac615c78e2a0e3a18f2b55d063570e333084e2e89596cda2523b97de27",
"url": "https://osv.dev/vulnerability/CVE-2026-87814",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "SiYuan before v3.8.2 Stored XSS via Asset Preview",
"summary": "SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in the search asset preview feature that fails to escape indexed asset content before inserting it into the DOM using innerHTML. Attackers who can place crafted text assets in a workspace can execute JavaScript in the SiYuan origin when victims preview the assets, enabling authenticated API requests and workspace manipulation.",
"evidence": "osv:CVE-2026-87814",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-87814",
"aliases": [
"CVE-2026-87814",
"GHSA-64gp-333q-mq6j"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/siyuan-note/siyuan",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "44a6c212a994c7ba8129fc38b001a9ab58957c6f"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "3.8.2"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"introduced": "0"
},
{
"fixed": "3.8.2"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-87814.json"
}
}
],
"modified": "2026-10-28T02:30:51.710074565Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87814.json",
"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-64gp-333q-mq6j",
"https://nvd.nist.gov/vuln/detail/CVE-2026-87814",
"https://www.vulncheck.com/advisories/siyuan-before-3.8.2-stored-xss-via-asset-preview"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87814.json"
}
},
"related_cves": [
{
"value": "CVE-2026-87814",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 520336,
"published_at": "2026-09-09T11:21:01.964+00:00"
}