CVE-2026-93921Public exploitNetwork attack vectorHinoki check available

Restricted metadata disclosure via unchecked icon templates

Published Sep 18, 2026 · Updated Sep 18, 2026

Missing authorization in SiYuan 3.8.4 and earlier allows remote authenticated users to read restricted document metadata via icon templates. The getDynamicIcon handler passes attacker-controlled type-8 content and a block ID to RenderDynamicIconContentTemplate, which loads the block and exposes template fields without the publish metadata authorization check. Publish mode and a known block ID are required; a RoleReader token, including the anonymous token used when publish authentication is disabled, can reveal titles, names, aliases, paths, and statistics but not document bodies.

CVSS severity5.3
Medium
EPSS probability0.38%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Missing authorization in SiYuan 3.8.4 and earlier allows remote authenticated users to read restricted document metadata via icon templates. The getDynamicIcon handler passes attacker-controlled type-8 content and a block ID to RenderDynamicIconContentTemplate, which loads the block and exposes template fields without the publish metadata authorization check. Publish mode and a known block ID are required; a RoleReader token, including the anonymous token used when publish authentication is disabled, can reveal titles, names, aliases, paths, and statistics but not document bodies.

The record

CVE
CVE-2026-93921
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-862, CWE-200, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=0 <=3.8.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SiYuan Note · SiYuanversion=0 <=3.8.4

Published CVSS scores

5.3VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
4.3VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
7.7siyuan-note GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
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

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Your stack

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