CVE-2026-23645
SiYuan Vulnerable to Stored Cross-Site Scripting (XSS) via Unrestricted SVG File Upload
Reported by github_m · Published January 16, 2026
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.
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| siyuan-note | siyuan | < 3.5.4-dev2 |
| siyuan-note | siyuan | 0 |
| github.com | siyuan-note/siyuan/kernel | 0 |
Timeline
- Jan 16, 2026 CVE Published
- Jan 16, 2026 CVE Updated
- Jan 17, 2026 EPSS Score (30 in total, the first dated here)
- Jan 17, 2026 PoC Published (6 in total, the first dated here)
- Jan 30, 2026 Security Advisory
- Mar 22, 2026 Coalition ESS Score (2 in total, the first dated here)
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References
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-pcjq-j3mq-jv5j x_refsource_CONFIRM
- https://github.com/siyuan-note/siyuan/issues/16844 x_refsource_MISC
- https://github.com/siyuan-note/siyuan/commit/11115da3d0de950593ee4ce375cf7f9018484388 x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-23645 advisory
- https://github.com/advisories/GHSA-pcjq-j3mq-jv5j advisory
- https://github.com/siyuan-note/siyuan url