CVE-2026-54069Public exploitNetwork attack vector

Unauthenticated admin API access via origin trust

Published Jun 24, 2026 · Updated Jun 24, 2026

Origin validation error in SiYuan before 3.7.0 allows remote attackers to obtain administrator API access through a browser extension. CheckAuth in kernel/model/session.go exempts every chrome-extension:// origin from authentication and assigns RoleAdministrator while desktop AccessAuthCode is empty by default. An installed Chrome or Chromium extension can then read workspace data, inject stored scripts, and alter kernel configuration through the loopback HTTP server.

CVSS severity9.2
Critical
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation error in SiYuan before 3.7.0 allows remote attackers to obtain administrator API access through a browser extension. CheckAuth in kernel/model/session.go exempts every chrome-extension:// origin from authentication and assigns RoleAdministrator while desktop AccessAuthCode is empty by default. An installed Chrome or Chromium extension can then read workspace data, inject stored scripts, and alter kernel configuration through the loopback HTTP server.

The record

CVE
CVE-2026-54069
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-346
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SiYuan Note · SiYuanversion=< 3.7.0

Published CVSS scores

9.2GitHubCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-346Origin Validation Error

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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