---
title: "CVE-2026-54069: SiYuan: Unauthenticated Admin API Access via Blanket chrome-extension:// Origin Allowlist"
url: https://erroneo.us/security/cve/CVE-2026-54069/
description: "CVE-2026-54069 (github.com/siyuan-note/siyuan/kernel (Go)): SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, SiYuan Note's…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-24
date_modified: 2026-07-10
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-54069"
kev: false
cvss: 9.2
epss: 0.00579
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-54069: SiYuan: Unauthenticated Admin API Access via Blanket chrome-extension:// Origin Allowlist

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.6% , percentile 47: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 47% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes github.com/siyuan-note/siyuan/kernel (Go) < 0.0.0-20260628153353-2d5d72223df4, fixed in 0.0.0-20260628153353-2d5d72223df4 . Check your lockfile, including transitive dependencies.

## What it is

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 packages

- Go `github.com/siyuan-note/siyuan/kernel` < 0.0.0-20260628153353-2d5d72223df4 → fixed: 0.0.0-20260628153353-2d5d72223df4

## Affected products (CVE record)

- siyuan-note siyuan: < 3.7.0

## Severity

- GitHub_M CVSS 4.0: 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`
- GitHub CVSS 4.0: 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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.58% probability of exploitation activity in the next 30 days; percentile 47.

## Sources

- [GitHub Advisory GHSA-hvr9-72v2-fff3](https://github.com/advisories/GHSA-hvr9-72v2-fff3)
- [CVE.org record CVE-2026-54069](https://www.cve.org/CVERecord?id=CVE-2026-54069)
- [NVD entry CVE-2026-54069](https://nvd.nist.gov/vuln/detail/CVE-2026-54069)
- [github.com](https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hvr9-72v2-fff3)

---
Source page: https://erroneo.us/security/cve/CVE-2026-54069/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt