\n\n```\n3. Upload a file in current daily note:\n $\"image\"$ \n $\"image\"$ \n $\"image\"$ \n4. Open the file:\n\n- Right-click the uploaded asset in the note.\n- Select \"Export\"\n $\"image\"$ \n5. The JavaScript code executes immediately.\n $\"image\"$ \n $\"image\"$ \n\n### Impact\nThe vulnerability allows to upload an SVG file containing malicious scripts. When a user exports this file, the embedded arbitrary JavaScript code is executed within their browser context\n\n### Notes\nTested version: \n $\"image\"$ \n\n### Solution\n\nhttps://github.com/siyuan-note/siyuan/issues/16844","datePublished":"2026-01-27T00:17:33.877000","dateModified":"2026-01-27T02:11:59.842000","author":{"@type":"Organization","name":"Strobes Security","url":"https://strobes.co"},"publisher":{"@type":"Organization","name":"Strobes VI","url":"https://vi.strobes.co"},"mainEntityOfPage":{"@type":"WebPage","@id":"https://vi.strobes.co/cve/CVE-2026-23645"},"about":{"@type":"Thing","name":"CVE-2026-23645","description":"Security vulnerability CVE-2026-23645 with CVSS score 0"},"keywords":["CVE-2026-23645","CVE","vulnerability","security","low","patch available"]}\n\n```\n3. Upload a file in current daily note:\n $\"image\"$ \n $\"image\"$ \n $\"image\"$ \n4. Open the file:\n\n- Right-click the uploaded asset in the note.\n- Select \"Export\"\n $\"image\"$ \n5. The JavaScript code executes immediately.\n $\"image\"$ \n $\"image\"$ \n\n### Impact\nThe vulnerability allows to upload an SVG file containing malicious scripts. When a user exports this file, the embedded arbitrary JavaScript code is executed within their browser context\n\n### Notes\nTested version: \n $\"image\"$ \n\n### Solution\n\nhttps://github.com/siyuan-note/siyuan/issues/16844"}},{"@type":"Question","name":"What is the severity of CVE-2026-23645?","acceptedAnswer":{"@type":"Answer","text":"CVE-2026-23645 has a CVSS v3 score of 0, which is classified as Low severity."}},{"@type":"Question","name":"Is there an exploit available for CVE-2026-23645?","acceptedAnswer":{"@type":"Answer","text":"No known public exploits are currently available for CVE-2026-23645."}},{"@type":"Question","name":"Is there a patch available for CVE-2026-23645?","acceptedAnswer":{"@type":"Answer","text":"Yes, patches are available for CVE-2026-23645. Check the vendor advisories for update instructions."}}]}

CVE-2026-23645

Published: January 27, 2026

Last updated:11 hours ago (January 27, 2026)

Exploit: NoZero-day: NoPatch: YesTrend: Neutral

TL;DR

Updated January 27, 2026

CVE-2026-23645 is a low severity vulnerability with a CVSS score of 0.0. No known exploits currently, and patches are available.

Key Points

1Low severity (CVSS 0.0/10)
2No known public exploits
3Vendor patches are available

Severity Scores

CVSS v30.0

CVSS v20.0

Priority Score0.0

EPSS Score0.0

None

Exploitation LikelihoodMinimal

0.00%EPSS

Very low probability of exploitation

Monitor and patch as resources allow

0.00%

EPSS

0.0

CVSS

Exploit

Yes

Patch

Low Priority

no major risk factors

EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.

Description

Summary

A Stored Cross-Site Scripting (XSS) vulnerability exists in SiYuan Note. The application does not sanitize uploaded SVG files. If a user uploads and views a malicious SVG file (e.g., imported from an untrusted source), arbitrary JavaScript code is executed in the context of their authenticated session.

Details

The application allows authenticated users to upload files, including .svg images, without sanitizing the input to remove embedded JavaScript code (such as <script> tags or event handlers).

PoC

Create a new "Daily note" in the workspace. <img width="1287" height="572" alt="image" src="https://github.com/user-attachments/assets/3a4389b9-695d-4e1b-94dc-72efdb047aa9" />
Create a file named test.svg with malicious JavaScript inside:

<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200" viewBox="0 0 124 124" fill="none">
<rect width="124" height="124" rx="24" fill="red"/>
   <script type="text/javascript">  
      alert(window.origin);
   </script>
</svg>

Upload a file in current daily note: <img width="1617" height="316" alt="image" src="https://github.com/user-attachments/assets/6e14318a-08ec-48e5-b278-9174ad17cfcb" />

<img width="1482" height="739" alt="image" src="https://github.com/user-attachments/assets/95c996e8-5591-436a-9467-ab56c9ffbde0" /> <img width="1321" height="548" alt="image" src="https://github.com/user-attachments/assets/249fb187-3caa-4372-a9c9-56dfda6b8a8f" /> 4. Open the file:

Right-click the uploaded asset in the note.
Select "Export" <img width="934" height="718" alt="image" src="https://github.com/user-attachments/assets/ec943dfa-92ba-47f6-8b1e-56e53f1b0ca6" />

The JavaScript code executes immediately. <img width="1033" height="632" alt="image" src="https://github.com/user-attachments/assets/a1611291-d333-4f8e-9da9-62104aaa1bdd" />

Impact

The vulnerability allows to upload an SVG file containing malicious scripts. When a user exports this file, the embedded arbitrary JavaScript code is executed within their browser context

Notes

Tested version: <img width="1440" height="534" alt="image" src="https://github.com/user-attachments/assets/a62271e4-6850-4f59-be88-c4f8055429c0" />

Solution

https://github.com/siyuan-note/siyuan/issues/16844

CVSS v3 Breakdown

Attack Vector:-

Attack Complexity:-

Privileges Required:-

User Interaction:-

Scope:-

Confidentiality:-

Integrity:-

Availability:-

Patch References

Github.com

Trend Analysis

Neutral

Advisories

GitHub Advisory NVD

Cite This Page

APA Format

Strobes VI. (2026). CVE-2026-23645 - CVE Details and Analysis. Strobes VI. Retrieved January 27, 2026, from https://vi.strobes.co/cve/CVE-2026-23645

Quick copy link + title

Please cite this page when referencing data from Strobes VI. Proper attribution helps support our vulnerability intelligence research.

<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200" viewBox="0 0 124 124" fill="none"> <rect width="124" height="124" rx="24" fill="red"/> <script type="text/javascript"> alert(window.origin); </script> </svg>