Path Traversal in B3log Siyuan
CVE-2026-23850
SiYuan is a personal knowledge management system. In versions prior to 3.5.4, the markdown feature allows unrestricted server side html-rendering which allows arbitrary file read (LFD). Version 3.5.4 fixes the issue.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (46.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001
Affected products
- B3log Siyuan
- Siyuan-Note Siyuan — versions < 3.5.4
Weakness classification (CWE)
References
- github.com/siyuan-note/siyuan/security/advisories/GHSA-cv54-7wv7-qxcw (Exploit, Patch, Vendor Advisory)
- github.com/siyuan-note/siyuan/issues/16860 (Patch, Issue Tracking)
- github.com/siyuan-note/siyuan/commit/b2274baba2e11c8cf8901b0c5c871e5b27f1f6dd (Patch)
- github.com/siyuan-note/siyuan/commit/f8f4b517077b92c90c0d7b51ac11be1b34b273ad (Patch)
- github.com/siyuan-note/siyuan/blob/master/kernel/model/file.go (Product)
- github.com/siyuan-note/siyuan/blob/v3.4.2/kernel/api/filetree.go (Product)
Frequently asked questions
- What is CVE-2026-23850?
- CVE-2026-23850 is a high-severity vulnerability in B3log Siyuan, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-01-19.
- How severe is CVE-2026-23850?
- High severity. CVSS v3 base score is 7.5 out of 10.