CVE-2026-23645 | THREATINT

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.

PUBLISHED Reserved 2026-01-14 | Published 2026-01-16 | Updated 2026-01-16 | Assigner GitHub_M

MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

< 3.5.4-dev2

affected

References

github.com/...siyuan/security/advisories/GHSA-pcjq-j3mq-jv5j

github.com/siyuan-note/siyuan/issues/16844

github.com/...ommit/11115da3d0de950593ee4ce375cf7f9018484388

cve.org (CVE-2026-23645)

nvd.nist.gov (CVE-2026-23645)

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