CVE-2026-23645

MEDIUM EPSS 16.3%
Published Jan 16, 20265mo ago · Modified Jun 17, 20262w ago
5.3 CVSS 4.0
Medium
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Published Jan 16, 2026 5mo ago
Last Modified Jun 17, 2026 2w ago

Description

SiYuan is self-hosted, open source personal knowledge management software. Prior to 3.5.4-dev2, a Stored Cross-Site Scripting (XSS) vulnerability exists in SiYuan Note. The application does not sanitize uploaded SVG files. If a user uploads and views a malicious SVG file (e.g., imported from an untrusted source), arbitrary JavaScript code is executed in the context of their authenticated session. This vulnerability is fixed in 3.5.4-dev2.

CVSS Details

Base Score
5.3
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/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
16.3% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 2

VendorProductVersionRange
b3logsiyuan* <3.5.4
b3logsiyuan3.5.4any

References 3

  • github.com https://github.com/siyuan-note/siyuan/commit/11115da3d0de950593ee4ce375cf7f9018484388
    Patch
  • github.com https://github.com/siyuan-note/siyuan/issues/16844
    Issue TrackingPatch
  • github.com https://github.com/siyuan-note/siyuan/security/advisories/GHSA-pcjq-j3mq-jv5j
    ExploitPatchVendor Advisory

Remediation

  • github.com https://github.com/siyuan-note/siyuan/commit/11115da3d0de950593ee4ce375cf7f9018484388
    Patch
  • github.com https://github.com/siyuan-note/siyuan/issues/16844
    Issue TrackingPatch
  • github.com https://github.com/siyuan-note/siyuan/security/advisories/GHSA-pcjq-j3mq-jv5j
    ExploitPatchVendor Advisory