What is CVE-2026-33670?

CVE-2026-33670 is a critical-severity vulnerability in B3log Siyuan, classified under Path Traversal. CVSS score: 9.8/10. Published 2026-03-26.

How severe is CVE-2026-33670?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Path Traversal in B3log Siyuan

CVE-2026-33670

SiYuan is a personal knowledge management system. Prior to version 3.6.2, the /api/file/readDir interface was used to traverse and retrieve the file names of all documents under a notebook. Version 3.6.2 patches the issue.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2026-03-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (49.0th percentile), scored 2026-10-21.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.006 · change: -0.000

Affected products

B3log Siyuan
Siyuan-Note Siyuan — versions < 3.6.2

Weakness classification (CWE)

CWE-22 — Path Traversal

References

github.com/siyuan-note/siyuan/security/advisories/GHSA-xmw9-6r43-x9ww (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33670?: CVE-2026-33670 is a critical-severity vulnerability in B3log Siyuan, classified under Path Traversal. CVSS score: 9.8/10. Published 2026-03-26.
How severe is CVE-2026-33670?: Critical severity. CVSS v3 base score is 9.8 out of 10.