CVE-2026-54069 json
SiYuan: Unauthenticated Admin API Access via Blanket chrome-extension:// Origin Allowlist
published 2026-06-24 4 mo ago modified 2026-10-25 14 d ago also GHSA-hvr9-72v2-fff3 , GO-2026-5961 , EUVD-2026-39125
- cvss
- 9.2
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 7.5%
- EPSS 7.5% chance of exploitation in 30 days, percentile 94%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
Patch / fix
- go github.com/siyuan-note/siyuan/kernel 0.0.0-20260628153353-2d5d72223df4
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 4 mo ago
Exploit prediction
7.47% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template SiYuan Note <= 3.6.5 - Authentication Bypass nuclei detection template
- github.com https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hvr9-72v2-fff3 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 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 |
| CNA | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/siyuan-note/siyuan/kernel | <0.0.0-20260628153353-2d5d72223df4 |
0.0.0-20260628153353-2d5d72223df4 |
Affected products
- siyuan-note siyuan
Classification
- Weakness
-
- CWE-346 Origin Validation Error
References
-
github.com
/siyuan-note/siyuan/security/advisories/GHSA-hvr9-72v2-fff3
exploit, web, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-54069
advisory
-
github.com
/siyuan-note/siyuan
package
Sources
- CVE List CVE-2026-54069
- GitHub Advisory GHSA-hvr9-72v2-fff3
- NVD CVE-2026-54069
- OSV GO-2026-5961
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