SiYuan through 3.8.4 fails to escape heading style attributes when rendering outline and bookmark dock HTML, allowing stored cross-site scripting. Attackers can supply crafted notebooks or call administrative endpoints to inject malicious style values that execute in the Electron renderer with full system access.
{
"cna_assigner": "VulnCheck",
"cwe_ids": [
"CWE-79"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93923.json"
}{
"extracted_events": [
{
"introduced": "0"
},
{
"last_affected": "3.8.4"
},
{
"fixed": "3.8.4"
}
],
"source": [
"AFFECTED_FIELD",
"DESCRIPTION"
]
}