CVE-2026-34585
SiYuan: Stored XSS in imported .sy.zip content leads to arbitrary command execution
Description
SiYuan is a personal knowledge management system. Prior to version 3.6.2, a vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a malicious IAL value inside a .sy document, package it as a .sy.zip, and have the victim import it through the normal Import -> SiYuan .sy.zip workflow. Once the note is opened, the malicious attribute breaks out of its original HTML context and injects an event handler, resulting in stored XSS. In the Electron desktop client, this XSS reaches remote code execution because injected JavaScript runs with access to Node/Electron APIs. 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, 4:52 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update SiYuan to version 3.6.2.
- Avoid importing untrusted .sy.zip files.
- Review and sanitize imported document attributes.
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-2026-34585.
| 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-ff66-236v-p4fg | Exploit Vendor Advisory |
| https://github.com/siyuan-note/siyuan/security/advisories/GHSA-ff66-236v-p4fg | 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-2026-34585 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-2026-34585
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-2026-34585 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34585 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 CVSS V3.1 AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H 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-ff66-236v-p4fg Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-ff66-236v-p4fg 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-ff66-236v-p4fg -
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 vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a malicious IAL value inside a .sy document, package it as a .sy.zip, and have the victim import it through the normal Import -> SiYuan .sy.zip workflow. Once the note is opened, the malicious attribute breaks out of its original HTML context and injects an event handler, resulting in stored XSS. In the Electron desktop client, this XSS reaches remote code execution because injected JavaScript runs with access to Node/Electron APIs. This issue has been patched in version 3.6.2. Added CVSS V3.1 AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H Added CWE CWE-79 Added CWE CWE-94 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-ff66-236v-p4fg