Is CVE-2026-41421 actively exploited?

No active exploitation of CVE-2026-41421 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-41421 be exploited remotely?

No. CVE-2026-41421 requires local access to exploit.

What is the CVSS score of CVE-2026-41421?

CVE-2026-41421 has a CVSS score of 8.8 (HIGH).

HOME VULNERABILITIESCVE-2026-41421

HIGH

CVE-2026-41421

CWE-78Published: April 24, 2026· Updated: Apr 27, 2026

8.8

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.1th

Official Description

SiYuan is an open-source personal knowledge management system. Prior to 3.6.5, SiYuan desktop renders notification messages as raw HTML inside an Electron renderer. The notification route POST /api/notification/pushMsg accepts a user-controlled msg value, forwards it through the backend broadcast layer, and the frontend inserts it into the DOM with insertAdjacentHTML(...) at message.ts. On desktop builds, this is not limited to ordinary XSS. Electron windows are created with nodeIntegration: true, contextIsolation: false, and webSecurity: false at main.js. As a result, JavaScript executed from the notification sink can directly access Node APIs and escalate to desktop code execution. This vulnerability is fixed in 3.6.5.

NVD Source

Technical Analysis

CVE-2026-41421 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.