High
SiYuan before v3.8.2 Stored XSS via notebook template paths
Type: advisorySources: OSV
SiYuan before v3.8.2 inserts persisted notebook template paths into HTML input value attributes without proper attribute encoding. Attackers can craft malicious template paths that break out of the attribute context and execute JavaScript when a victim opens notebook configuration, enabling same-origin API requests and application state manipulation.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-87811
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 02:54 UTC · Revision 1
Source evidence
SiYuan before v3.8.2 Stored XSS via notebook template paths
core-osv · Original sourcePublished 9 Sept 2026, 11:20 UTC
SiYuan before v3.8.2 inserts persisted notebook template paths into HTML input value attributes without proper attribute encoding. Attackers can craft malicious template paths that break out of the attribute context and execute JavaScript when a victim opens notebook configuration, enabling same-origin API requests and application state manipulation.
osv:CVE-2026-87811
Complete source record
{
"id": "31a8868de6e1897262f7ddc8f08c8628fd5d8b954492540f1eabdc6d14a1e048",
"url": "https://osv.dev/vulnerability/CVE-2026-87811",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "SiYuan before v3.8.2 Stored XSS via notebook template paths",
"summary": "SiYuan before v3.8.2 inserts persisted notebook template paths into HTML input value attributes without proper attribute encoding. Attackers can craft malicious template paths that break out of the attribute context and execute JavaScript when a victim opens notebook configuration, enabling same-origin API requests and application state manipulation.",
"evidence": "osv:CVE-2026-87811",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-87811",
"aliases": [
"CVE-2026-87811",
"GHSA-v6wf-r2gr-rrgf"
],
"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-2026-87811.json"
}
}
],
"modified": "2026-10-28T02:30:48.987981831Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87811.json",
"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-v6wf-r2gr-rrgf",
"https://nvd.nist.gov/vuln/detail/CVE-2026-87811",
"https://www.vulncheck.com/advisories/siyuan-before-3.8.2-stored-xss-via-notebook-template-paths"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87811.json"
}
},
"related_cves": [
{
"value": "CVE-2026-87811",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 517536,
"published_at": "2026-09-09T11:20:59.734+00:00"
}