CVE-2026-23852

MEDIUM EPSS 47.7%
Published Jan 19, 20265mo ago · Modified Jun 17, 20262w ago
5.8 CVSS 4.0
Medium
Find Similar
Published Jan 19, 2026 5mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.8
Exploitability
—
Impact
—
Vector string
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction P
Scope X

Threat Intelligence

EPSS Exploit Probability
47.7% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-79 Cross-site Scripting Injection
CWE-94 Improper Control of Generation of Code (Code Injection) Injection

Affected Products 1

VendorProductVersionRange
b3logsiyuan* <3.5.4

References 2

  • github.com https://github.com/siyuan-note/siyuan/commit/0be7e1d4e0da9aac0da850b7aeb9b50ede7e5bdb
    Patch
  • github.com https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7c6g-g2hx-23vv
    ExploitPatchVendor Advisory

Remediation

  • github.com https://github.com/siyuan-note/siyuan/commit/0be7e1d4e0da9aac0da850b7aeb9b50ede7e5bdb
    Patch
  • github.com https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7c6g-g2hx-23vv
    ExploitPatchVendor Advisory