XSS in Siyuan-Note Siyuan
CVE-2026-92986
SiYuan before 3.8.4 renders document titles as HTML in the backlink dock tree without escaping markup characters. Attackers can set malicious titles through the rename API or crafted notebooks to execute scripts in the Electron renderer with access to child_process for 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/commit/6f093ebe50afc503e2a8b056164293054f8509e7 (patch)
- github.com/siyuan-note/siyuan (product)
- github.com/siyuan-note/siyuan/security/advisories/GHSA-c5h9-g2c6-fxjw (vendor-advisory)
- github.com/siyuan-note/siyuan/blob/v3.8.3/app/src/util/Tree.ts (technical-description)
- www.vulncheck.com/advisories/siyuan-before-3.8.4-cross-site-scripting-via-docum… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-92986?
- CVE-2026-92986 is a high-severity vulnerability in Siyuan-Note Siyuan, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-09-17.
- How severe is CVE-2026-92986?
- High severity. CVSS v3 base score is 8.8 out of 10.