CVE-2026-23645

MEDIUM

SiYuan < 3.5.4-dev2 - Stored Cross-Site Scripting via SVG File Upload

Title source: llm
STIX 2.1

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.

References (3)

Core 3

Scores

CVSS v3 6.1
EPSS 0.0025
EPSS Percentile 16.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (3)
b3log/siyuan 3.5.4 dev1
b3log/siyuan < 3.5.4
siyuan-note/siyuan 0 - 0.0.0-20260116101155-11115da3d0deGo
Published Jan 16, 2026
Tracked Since Feb 18, 2026