CVE-2026-72803Public exploitNetwork attack vector

Protected-document disclosure via omitted publish-access checks

Published Aug 12, 2026 · Updated Aug 12, 2026

Missing authorization in SiYuan before 3.7.4 allows remote attackers to read attributes from protected documents via API requests. The getBlockAttrs and batchGetBlockAttrs handlers return complete attribute sets without calling the publish-access filter applied by a sibling endpoint. Publish mode and known block IDs are required; anonymous access depends on disabled publish authentication, while any RoleReader account can retrieve names, aliases, memos, tags, and custom fields.

CVSS severity5.8
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Missing authorization in SiYuan before 3.7.4 allows remote attackers to read attributes from protected documents via API requests. The getBlockAttrs and batchGetBlockAttrs handlers return complete attribute sets without calling the publish-access filter applied by a sibling endpoint. Publish mode and known block IDs are required; anonymous access depends on disabled publish authentication, while any RoleReader account can retrieve names, aliases, memos, tags, and custom fields.

The record

CVE
CVE-2026-72803
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-862, T1213
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <3.7.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SiYuan Note · SiYuanversion=0 <3.7.4

Published CVSS scores

6.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
5.8GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1213Data from Information Repositories

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo