XSS in Siyuan-Note Siyuan
CVE-2026-93922
SiYuan through 3.8.4 renders notebook names as raw HTML in the Daily Note picker dialog without escaping, allowing stored cross-site scripting in the Electron renderer. Attackers can create notebooks with HTML payloads in names that execute JavaScript with Node.js access when the picker opens, enabling operating system command execution.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (57.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/siyuan-note/siyuan/security/advisories/GHSA-8c2m-33v9-vvqm (vendor-advisory)
- github.com/siyuan-note/siyuan (product)
- github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/mount.ts (technical-description)
- github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/file.go (technical-description)
- www.vulncheck.com/advisories/siyuan-through-3.8.4-stored-xss-via-notebook-names (third-party-advisory)
Frequently asked questions
- What is CVE-2026-93922?
- CVE-2026-93922 is a high-severity vulnerability in Siyuan-Note Siyuan, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-09-19.
- How severe is CVE-2026-93922?
- High severity. CVSS v3 base score is 8.8 out of 10.