Stored Cross-Site Scripting Vulnerability in SiYuan by SiYuan Note
CVE-2026-82653

9.3CRITICAL

Key Information:

Vendor

Siyuan-note

Status
Siyuan
Vendor
CVE Published:
30 August 2026

What is CVE-2026-82653?

SiYuan versions prior to 3.8.1 contain a vulnerability that allows for stored cross-site scripting via the confirmDialog() function. This occurs when unescaped package names and notebook names are directly interpolated in innerHTML assignments. Attackers can exploit this by submitting malicious bazaar package names containing HTML or script payloads. When users uninstall the packages or unlock encrypted notebooks, these malicious scripts can execute in their browsers, potentially compromising their security and data.

Affected Version(s)

siyuan 0 < 3.8.1

siyuan 3.8.1

References

https://github.com/siyuan-note/siyuan/security/advisories...
vendor-advisory
https://www.vulncheck.com/advisories/siyuan-before-3.8.1-...
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

alham-rizvi
hey-raghav
.