Cross-Site Scripting in SiYuan Application by SiYuan Technology
CVE-2026-75916

9.3CRITICAL

Key Information:

Vendor

Siyuan-note

Status
Siyuan
Vendor
CVE Published:
19 August 2026

What is CVE-2026-75916?

SiYuan, up to version 3.7.3, contains a cross-site scripting vulnerability within the block-reference autocomplete hint popup. The vulnerability arises from the improper concatenation of user-controlled data into the HTML output of the hint popup without adequate escaping. This allows an attacker to insert malicious scripts into the block's metadata, which can execute when a victim interacts with the autocomplete functionality. Since the application runs its Electron windows with node integration and without context isolation, the vulnerability can escalate to arbitrary operating system command execution, posing significant security risks to users.

References

https://github.com/siyuan-note/siyuan/security/advisories...
vendor-advisory
https://www.vulncheck.com/advisories/siyuan-xss-to-rce-vi...
third-party-advisory

CVSS V4

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

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

alham-rizvi
hey-raghav
.