CVE-2026-54069 SiYuan: Unauthenticated Admin API Access via Blanket chrome-extension:// Origin Allowlist
Unauthenticated browser extensions can access admin APIs due to overly permissive origin allowlisting, enabling data theft and code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-54069?
CVE-2026-54069 is a critical authentication bypass vulnerability in siyuan-note siyuan, published on 24 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-346
Which versions are affected by CVE-2026-54069?
3 open source packages ship an affected version, including github.com/siyuan-note/siyuan/kernel.
| Package | Affected | Fixed in |
|---|---|---|
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260628153353-2d5d72223df4 |
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260628153353-2d5d72223df4 |
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260628153353-2d5d72223df4 |
How do I fix CVE-2026-54069?
Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260628153353-2d5d72223df4 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-54069 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54069 exists.
Public exploit code: 1 Nuclei template.
Sources
Also known as GHSA-hvr9-72v2-fff3, GO-2026-5961.