Is this vulnerability remotely exploitable?

Yes. If an attacker can reach the `/api/attr/setBlockAttrs` endpoint or otherwise cause malicious `icon` attributes to be stored, the payload is delivered to any user who later renders the affected block, including over remote sessions.

What level of access does an attacker need?

The attacker typically needs the ability to create or modify blocks or to call the attribute-setting API with their own data. This could come from a compromised user account, malicious plugin, or integration that has write access.

What is the safest general fix pattern?

Constrain the `icon` attribute to a strictly validated data format (e.g., icon names or IDs) and ensure that all rendering uses context-appropriate escaping. Do not allow arbitrary HTML or attributes from user-controlled sources to influence markup or scriptable surfaces.

Severity:

CRITICAL RISK

(9.6)

Stored Cross-Site Scripting to Code Injection (CWE-79/CWE-94) in SiYuan Dynamic Icons

CVE-2026-23852

Published:

Jan 19, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Cross-Site Scripting (Stored)

CWE:

CWE-94;CWE-79

Impact:

Stored XSS with Potential Remote Code Execution in Desktop Environment

Severity:

CRITICAL RISK

(9.6)

CVSS Version:

3.1

Vulnerability Type

Category:

Cross-Site Scripting (Stored)

CWE:

CWE-94;CWE-79

Impact:

Stored XSS with Potential Remote Code Execution in Desktop Environment

Severity:

CRITICAL RISK

(9.6)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Stored Cross-Site Scripting to Code Injection (CWE-79/CWE-94) in SiYuan Dynamic Icons

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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