Stored XSS in SiYuan Desktop Versions Prior to 3.8.4
CVE-2026-100641

8.6HIGH

Key Information:

Vendor

Siyuan-note

Status
Siyuan
Vendor
CVE Published:
26 September 2026

What is CVE-2026-100641?

In SiYuan Desktop versions before 3.8.4, an unescaped stored flashcard block content allows for the injection of malicious scripts into the card manager. When executed, these scripts can run in a privileged renderer due to nodeIntegration being enabled and contextIsolation being disabled. This means that when an administrator views the card manager with attacker-supplied content, the injected code can be executed, potentially leading to arbitrary code execution on the host system.

Affected Version(s)

siyuan 0 < 3.8.4

siyuan 3.8.4

References

https://github.com/siyuan-note/siyuan/security/advisories...
vendor-advisory
https://github.com/siyuan-note/siyuan/commit/1ecb1c07de49...
patch
https://github.com/siyuan-note/siyuan/commit/48c354e7de13...
patch

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

rexpository
.