PT-2026-3498 · Siyuan · Siyuan

0Xnayel · CVE-2026-23852 · Published 2026-01-19 · Updated 2026-01-20

Positive Technologies (AI Summary)

CVSS v3.1

9.6

Critical

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions SiYuan versions prior to 3.5.4

Description SiYuan is a personal knowledge management system with a stored Cross-Site Scripting (XSS) issue. An attacker can inject arbitrary HTML attributes into the icon attribute of a block through the /api/attr/setBlockAttrs API endpoint. The payload is rendered unsanitized in the dynamic icon feature, leading to stored XSS and potentially remote code execution (RCE) in the desktop environment. This bypasses a previous fix for issue #15970. The vulnerable parameter is icon.

Recommendations Update to version 3.5.4 or later.

Exploit

Fix

RCE

Code Injection

XSS

Weakness Enumeration

CWE-94

CWE-79

Related Identifiers

CVE-2026-23852

GHSA-7C6G-G2HX-23VV

Affected Products

Siyuan

References · 7

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23852.json · Exploit
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7c6g-g2hx-23vv · Patch
• https://github.com/siyuan-note/siyuan/commit/0be7e1d4e0da9aac0da850b7aeb9b50ede7e5bdb · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-23852 · Security Note
• https://osv.dev/vulnerability/CVE-2026-23852 · Vendor Advisory
• https://twitter.com/VulmonFeeds/status/2013408782596939963 · Twitter Post
• https://twitter.com/CVEnew/status/2013345632338002075 · Twitter Post