CVE-2026-65606Critical· 9.6▾ AbyssalPoC available

SiYuan before v3.7.2 contains a cross-site scripting vulnerability in the siyuan:// protocol handler

▾ Abyssal zone — Critical with a public exploit or in-the-wild use

Depth score65/ 100 · Elevated

impact 52.8 · likelihood 0.2 · exploitation 12

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

A public proof-of-concept already exists for this vulnerability — see Exploit availability below.

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Published

Jul 23, 2026

Updated

Sep 17, 2026

CVSS

9.6

Vendor

siyuan-note

Product

siyuan

CWE

CWE-79

Depth score

65 · Elevated

EPSS

0.79% · p56

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CISA SSVC

decided 2026-07-23

Exploitation: poc
Automatable: no
Technical impact: total

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.

EPSS history

Exploit-prediction probability, daily snapshots since Sep 17.

0.8% → 0.8%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

3 events · 56 days

Jul 23, 2026Published
Disclosed via NVD
Sep 17, 2026Record revised
Last analysed / modified upstream
Sep 17, 2026EPSS first tracked
0.8%

siyuan-note CWE-79 #nvd #cve.org #exploit-available

Affected

siyuan < 3.7.2

Full technical detail▾

Overview

SiYuan before v3.7.2 contains a cross-site scripting vulnerability in the siyuan:// protocol handler. When a siyuan://plugins/<name> link references a name that is not an installed plugin, the application opens a custom tab and inserts the link's icon parameter into the tab header via innerHTML without escaping it (app/src/layout/Tab.ts), allowing injection of an <img onerror=...> element. Because the SiYuan Desktop renderer runs with nodeIntegration:true, the injected JavaScript can access Node's require and call require('child_process').execSync(...), escalating the cross-site scripting into arbitrary operating-system command execution.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org#exploit-available

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