SiYuan up to 3.6.1 mAsse cross site scripting

Summaryinfo

A vulnerability was found in SiYuan up to 3.6.1. It has been classified as problematic. This impacts an unknown function. This manipulation of the argument mAsse causes cross site scripting. This vulnerability appears as CVE-2026-34448. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic was found in SiYuan up to 3.6.1. Affected by this vulnerability is an unknown code block. The manipulation of the argument mAsse with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

SiYuan is a personal knowledge management system. Prior to version 3.6.2, an attacker who can place a malicious URL in an Attribute View mAsse field can trigger stored XSS when a victim opens the Gallery or Kanban view with “Cover From -> Asset Field” enabled. The vulnerable code accepts arbitrary http(s) URLs without extensions as images, stores the attacker-controlled string in coverURL, and injects it directly into an <img src="..."> attribute without escaping. In the Electron desktop client, the injected JavaScript executes with nodeIntegration enabled and contextIsolation disabled, so the XSS reaches arbitrary OS command execution under the victim’s account. This issue has been patched in version 3.6.2.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-34448 since 03/27/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 3.6.2 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Name

• SiYuan

Version

• 3.6.0
• 3.6.1

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