CVE-2026-45371Public exploitNetwork attack vector

Unauthorized state mutation via missing API guards

Published May 14, 2026 · Updated May 14, 2026

Improper authorization in SiYuan before 3.7.0 allows remote attackers to alter configuration and SQL index state through eight APIs. The routes use model.CheckAuth but omit model.CheckAdminRole and model.CheckReadonly before saving server state, including conf.json through model.Conf.Save(). A publish-mode RoleReader JWT, issued to anonymous visitors, or a read-only RoleEditor JWT reaches the writes, enabling persistent configuration and index changes.

CVSS severity7.2
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in SiYuan before 3.7.0 allows remote attackers to alter configuration and SQL index state through eight APIs. The routes use model.CheckAuth but omit model.CheckAdminRole and model.CheckReadonly before saving server state, including conf.json through model.Conf.Save(). A publish-mode RoleReader JWT, issued to anonymous visitors, or a read-only RoleEditor JWT reaches the writes, enabling persistent configuration and index changes.

The record

CVE
CVE-2026-45371
Published
May 14, 2026
Updated
May 14, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-862, CWE-285, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 2026CVE publishedPublication date reported by the CVE source.
  2. May 14, 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

7.2GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/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-862Missing Authorization
CWE-285Improper Authorization
T1565.001Stored Data Manipulation

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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