CVE-2026-23852

Published January 19th, 2026

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CVSS v3

9.6

CRITICAL

CVSS v2

N/A

Affected

PROJECT

Description

SiYuan is a personal knowledge management system. Versions prior to 3.5.4 have a stored Cross-Site Scripting (XSS) vulnerability that allows an attacker to inject arbitrary HTML attributes into the `icon` attribute of a block via the `/api/attr/setBlockAttrs` API. The payload is later rendered in the dynamic icon feature in an unsanitized context, leading to stored XSS and, in the desktop environment, potential remote code execution (RCE). This issue bypasses the previous fix for issue `#15970` (XSS → RCE via dynamic icons). Version 3.5.4 contains an updated fix.

siyuan-note/siyuan

A privacy-first, self-hosted, fully open source personal knowledge management software, written in typescript and golang.

GitHub

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