CVE-2026-75917High· 8.6▾ MidnightPoC available

SiYuan before v3.7.4 contains a cross-site scripting vulnerability in the file-tree picker's hover-tooltip generation (app/src/util/pathName.ts, getLeaf()/movePathTo()) used by the 'move/link to' path-selection dialogs, where document me…

▾ Midnight zone — Critical, or high with PoC / in-the-wild

Depth score59/ 100 · Moderate

impact 47.3 · likelihood 0 · 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

Aug 19, 2026

Updated

Oct 8, 2026

CVSS

8.6

Vendor

siyuan-note

Product

siyuan

CWE

CWE-79

Depth score

59 · Moderate

EPSS

0.24% · p14

Platforms

—

Source

NVD

Vector

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

CISA SSVC

decided 2026-08-20

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.

Timeline

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

3 events · 50 days

Aug 19, 2026Published
Disclosed via NVD
Oct 8, 2026Record revised
Last analysed / modified upstream
Oct 8, 2026EPSS first tracked
0.2%

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

Affected

siyuan < 3.7.4

Full technical detail▾

Overview

SiYuan before v3.7.4 contains a cross-site scripting vulnerability in the file-tree picker's hover-tooltip generation (app/src/util/pathName.ts, getLeaf()/movePathTo()) used by the 'move/link to' path-selection dialogs, where document metadata fields (bookmark, alias, memo, and an alternate name field) are concatenated into the aria-label HTML attribute without escaping. A document crafted with a double quote in any of these fields breaks out of the attribute context and injects arbitrary HTML attributes including inline event handlers (e.g., onmouseover). Because every SiYuan Electron BrowserWindow runs with nodeIntegration:true, contextIsolation:false, and no CSP, the injected handler gains require('child_process') access, escalating the XSS to arbitrary OS command execution when a victim merely hovers over the malicious document entry in the path-picker dialog. Malicious documents reach victims via sharing, sync, or import.

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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