CVE-2026-75917 — SiYuan before v3.7.4 contains a cross-site scripting vulnerability in the file-tree…¶
Key facts
CVE-2026-75917 is a High (8.6) vulnerability: SiYuan before v3.7.4 contains a cross-site scripting vulnerability in the file-tree…. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-75917 |
| Severity | High (8.6) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-75917/ |
Details¶
English | 한국어
Description¶
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.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-75917 |
| Type | XSS |
| CVSS Score | 8.6 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-75917/poc.py
Usage¶
# Run PoC against target
python3 poc.py --target <TARGET_URL>
# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>
⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.
Test Lab¶
This repository includes a Docker-based test environment with both vulnerable and patched applications.
Quick Start¶
# Clone and navigate to CVE directory
cd CVE-2026-75917
# Start both applications
docker-compose up -d
# Run tests
./run-tests.sh # Linux/Mac
./run-tests.ps1 # Windows PowerShell
Application Endpoints¶
| Application | URL | Status |
|---|---|---|
| Vulnerable App | http://localhost:8080 | Shows vulnerability |
| Patched App | http://localhost:8081 | Demonstrates fix |
Directory Structure¶
├── README.md # English documentation
├── README_KO.md # Korean documentation
├── poc.py # PoC detection script
├── docker-compose.yml # Container orchestration
├── run-tests.sh # Linux/Mac test runner
├── run-tests.ps1 # Windows test runner
├── vulnerable-app/ # Vulnerable version
│ ├── app.py
│ ├── Dockerfile
│ └── requirements.txt
└── patched-app/ # Fixed version
├── app.py
├── Dockerfile
└── requirements.txt
References¶
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jjq3-3942-x99r
- https://www.vulncheck.com/advisories/siyuan-before-xss-to-rce-via-pathname-ts
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jjq3-3942-x99r
Generated by PoC Generator on 2026-08-24T21:38:43.141527748
Frequently asked questions¶
What is CVE-2026-75917?¶
CVE-2026-75917 is a High (8.6) vulnerability: SiYuan before v3.7.4 contains a cross-site scripting vulnerability in the file-tree…. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-75917?¶
Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.
How do I block or mitigate CVE-2026-75917?¶
Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.
For authorized security testing and research only. See the full source and NVD record.