CVE-2026-23852Public exploitNetwork attack vectorHinoki check available

Desktop command execution via unsanitized block icon

Published Jan 19, 2026 · Updated Jan 19, 2026

Stored XSS in SiYuan before 3.5.4 allows remote attackers to execute JavaScript, or desktop commands, through a crafted block icon. The /api/attr/setBlockAttrs endpoint stores an attacker-controlled attrs.icon value, and the dynamic-icon renderer inserts it into an HTML attribute without escaping; quote injection adds an event handler. Reaching the API and modifying a block are required, and another user must render that block; Electron's Node bridge then turns the script into commands at that user's privileges.

CVSS severity9.6
Critical
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in SiYuan before 3.5.4 allows remote attackers to execute JavaScript, or desktop commands, through a crafted block icon. The /api/attr/setBlockAttrs endpoint stores an attacker-controlled attrs.icon value, and the dynamic-icon renderer inserts it into an HTML attribute without escaping; quote injection adds an event handler. Reaching the API and modifying a block are required, and another user must render that block; Electron's Node bridge then turns the script into commands at that user's privileges.

The record

CVE
CVE-2026-23852
Published
Jan 19, 2026
Updated
Jan 19, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-94, CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 19, 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=< 3.5.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SiYuan Note · SiYuanversion=< 3.5.4

Published CVSS scores

9.6NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
5.8GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:P

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-94Improper Control of Generation of Code ('Code Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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