# CVE-2026-54069

## Summary

- **CVE ID:** CVE-2026-54069
- **Severity:** CRITICAL
- **CVSS Score:** 9.2 (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-346
- **Published:** Jun 24, 2026
- **Last Modified:** Jun 25, 2026

## Description

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, SiYuan Note's kernel HTTP server unconditionally trusts all chrome-extension:// origins, granting RoleAdministrator access to every installed browser extension without any authentication. Combined with the default empty AccessAuthCode on desktop installs, any Chrome/Chromium extension -- including a compromised legitimate extension via supply chain attack -- can make fully authenticated admin API calls to the SiYuan kernel at 127.0.0.1:6806, enabling data exfiltration, stored XSS injection, and configuration tampering. This vulnerability is fixed in 3.7.0.

## Affected Products

- siyuan-note — siyuan (< 3.7.0)

## References

- [CNA](https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hvr9-72v2-fff3)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.58%
- **EPSS Percentile:** 45.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._