CVE-2026-34449
SiYuan: Cross-Origin RCE via Permissive CORS Policy and JavaScript Snippet Injection
Description
SiYuan is a personal knowledge management system. Prior to version 3.6.2, a malicious website can achieve Remote Code Execution (RCE) on any desktop running SiYuan by exploiting the permissive CORS policy (Access-Control-Allow-Origin: * + Access-Control-Allow-Private-Network: true) to inject a JavaScript snippet via the API. The injected snippet executes in Electron's Node.js context with full OS access the next time the user opens SiYuan's UI. No user interaction is required beyond visiting the malicious website while SiYuan is running. This issue has been patched in version 3.6.2.
INFO
Published Date :
March 31, 2026, 10:16 p.m.
Last Modified :
April 3, 2026, 4:57 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | MITRE-CVE |
Solution
- Update SiYuan to version 3.6.2 or later.
- Verify CORS policy configuration for security.
- Review API access logs for suspicious activity.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34449.
| URL | Resource |
|---|---|
| https://github.com/siyuan-note/siyuan/issues/17246 | Issue Tracking |
| https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2 | Release Notes |
| https://github.com/siyuan-note/siyuan/security/advisories/GHSA-68p4-j234-43mv | Exploit Vendor Advisory |
| https://github.com/siyuan-note/siyuan/security/advisories/GHSA-68p4-j234-43mv | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34449 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34449
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34449 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34449 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 03, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* versions up to (excluding) 3.6.2 Added Reference Type GitHub, Inc.: https://github.com/siyuan-note/siyuan/issues/17246 Types: Issue Tracking Added Reference Type GitHub, Inc.: https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2 Types: Release Notes Added Reference Type CISA-ADP: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-68p4-j234-43mv Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-68p4-j234-43mv Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 01, 2026
Action Type Old Value New Value Added Reference https://github.com/siyuan-note/siyuan/security/advisories/GHSA-68p4-j234-43mv -
New CVE Received by [email protected]
Mar. 31, 2026
Action Type Old Value New Value Added Description SiYuan is a personal knowledge management system. Prior to version 3.6.2, a malicious website can achieve Remote Code Execution (RCE) on any desktop running SiYuan by exploiting the permissive CORS policy (Access-Control-Allow-Origin: * + Access-Control-Allow-Private-Network: true) to inject a JavaScript snippet via the API. The injected snippet executes in Electron's Node.js context with full OS access the next time the user opens SiYuan's UI. No user interaction is required beyond visiting the malicious website while SiYuan is running. This issue has been patched in version 3.6.2. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H Added CWE CWE-942 Added Reference https://github.com/siyuan-note/siyuan/issues/17246 Added Reference https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2 Added Reference https://github.com/siyuan-note/siyuan/security/advisories/GHSA-68p4-j234-43mv