Is this vulnerability remotely exploitable over the internet?

Yes. If the SiYuan instance exposes the `/api/icon/getDynamicIcon` endpoint over the network, an unauthenticated attacker can craft a malicious URL and send it to victims, who only need to visit the link and click the injected SVG element for code execution.

Does exploitation require authentication or an existing user account?

No attacker authentication is required to generate the malicious SVG, but impact is higher when the victim is authenticated to the SiYuan application or related domains, since any actions performed by the injected script occur in the victim's authenticated browser session.

What is the safest general fix pattern for this issue?

The most robust fix is to combine strict, context-aware output encoding for all user-controlled data in SVG/HTML with an allowlist-based URL policy that only permits safe schemes (e.g., `https`, `http`) in link attributes, avoiding reliance on partial blocklists.

Severity:

CRITICAL RISK

(9.3)

Stored SVG-based Cross-Site Scripting (CWE-79) via Incomplete Sanitization in SiYuan Dynamic Icon API

CVE-2026-32940

Published:

Mar 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

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May 6, 2026

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HIGH RISK

HIGH

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May 6, 2026

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79;CWE-184

Impact:

Client-Side Code Execution / Session Compromise

Severity:

CRITICAL RISK

(9.3)

CVSS Version:

3.1

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79;CWE-184

Impact:

Client-Side Code Execution / Session Compromise

Severity:

CRITICAL RISK

(9.3)

CVSS Version:

3.1

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Stored SVG-based Cross-Site Scripting (CWE-79) via Incomplete Sanitization in SiYuan Dynamic Icon API

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

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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