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.
The vulnerable code accepts any URLs with http(s) protocol as the image value in the 'Cover From -> Asset Field'. The attacker-controlled string is saved in the coverURL variable and inserted directly into the src attribute of the <img> tag without any escaping. When the victim opens the Gallery or Kanban view with the 'Cover From -> Asset Field' option enabled, the malicious JavaScript payload is executed. In the Electron client, the vulnerability has critical scope — the application runs with nodeIntegration enabled and contextIsolation disabled, which allows escape from the browser sandbox and execution of arbitrary operating system commands.
An attacker can execute arbitrary code at the operating system level in the context of the logged-in user account (RCE), which enables complete takeover of the victim's workstation, data theft, and further lateral movement in the network.
SiYuan should be updated to version 3.6.2 or later, where the issue has been fixed. The patch is available in the official project repository: https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2
B3Log SiYuan in all versions before 3.6.2, particularly the Electron-based desktop client with nodeIntegration enabled and contextIsolation disabled
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:HB3log Siyuan
APPB3Log< 3.6.2
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