CVE-2026-23852

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.

CVSS v3 9.6 CRITICAL

9.6^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 2.8 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://github.com/siyuan-note/siyuan/commit/0be7e1d4e0da9aac0da850b7aeb9b50ede7e5bdb	Patch
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7c6g-g2hx-23vv	Exploit Vendor Advisory Patch

Configurations

Configuration 1 (hide)

cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-01-19 20:15

Updated : 2026-01-30 15:08

NVD link : CVE-2026-23852

Mitre link : CVE-2026-23852

CVE.ORG link : CVE-2026-23852

JSON object : View

Products Affected

b3log

siyuan

CWE

CWE-94

Improper Control of Generation of Code ('Code Injection')

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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