Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-23852— SiYuan vulnerable to Stored XSS / RCE via `setBlockAttrs` icon attribute

Quick assessment

Affected
siyuan-note siyuan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SiYuan是SiYuan开源的一个隐私至上的个人知识管理系统。 SiYuan 3.5.4之前版本存在代码注入漏洞，该漏洞源于/api/attr/setBlockAttrs API允许攻击者将任意HTML属性注入块的icon属性，可能导致存储型跨站脚本攻击，在桌面环境中可能导致远程代码执行。

AI Predicted 8.1 Difficulty: Easy EPSS 0.81% · P56
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-23852

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
SiYuan vulnerable to Stored XSS / RCE via `setBlockAttrs` icon attribute
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan开源的一个隐私至上的个人知识管理系统。 SiYuan 3.5.4之前版本存在代码注入漏洞，该漏洞源于/api/attr/setBlockAttrs API允许攻击者将任意HTML属性注入块的icon属性，可能导致存储型跨站脚本攻击，在桌面环境中可能导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan < 3.5.4 -

II. Public POCs for CVE-2026-23852

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-23852

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-23852 (1)

Same Patch Batch · siyuan-note · 2026-01-19 · 4 CVEs total

CVE-2026-23851 SiYuan Vulnerable to Arbitrary File Read via File Copy Functionality
CVE-2026-23850 SiYuan vulnerable to arbitrary file read
CVE-2026-23847 SiYuan Vulnerable to Reflected Cross-Site Scripting (XSS) via /api/icon/getDynamicIcon

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-94

V. Comments for CVE-2026-23852

No comments yet

Leave a comment