CVE-2026-59833Public exploitNetwork attack vector

User-triggered command execution via incomplete URL sanitization

Published Jul 9, 2026 · Updated Jul 9, 2026

Stored XSS in SiYuan before 3.7.1 allows remote attackers to execute OS commands through a crafted note or Bazaar package. Lute's sanitizeAttrs checks dangerous schemes for src, srcset, and href but omits form action and SVG xlink:href before SiYuan inserts the HTML. A desktop user must open the attacker-controlled export preview or README and click the rendered element; browser/server builds expose XSS without Electron command execution.

CVSS severity8.6
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in SiYuan before 3.7.1 allows remote attackers to execute OS commands through a crafted note or Bazaar package. Lute's sanitizeAttrs checks dangerous schemes for src, srcset, and href but omits form action and SVG xlink:href before SiYuan inserts the HTML. A desktop user must open the attacker-controlled export preview or README and click the rendered element; browser/server builds expose XSS without Electron command execution.

The record

CVE
CVE-2026-59833
Published
Jul 9, 2026
Updated
Jul 9, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-116, CWE-94, CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 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=< 3.7.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SiYuan Note · SiYuanversion=< 3.7.1

Published CVSS scores

8.6GitHub CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.0siyuan-note GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
9.6siyuan-note GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

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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