Auth bypass in Siyuan-Note Siyuan
CVE-2026-85578
SiYuan through 3.8.1 contains an authorization bypass vulnerability in the /api/file/getFile endpoint that allows readers to retrieve files from notebooks explicitly configured as Visible:false. Attackers with reader role can access private workspace files including notebook metadata and internal configuration by knowing the hidden notebook identifier and file path.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (30.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/siyuan-note/siyuan/security/advisories/GHSA-8ggq-wq3f-vxrw (vendor-advisory)
- www.vulncheck.com/advisories/siyuan-through-3.8.1-authorization-bypass-via-getf… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85578?
- CVE-2026-85578 is a medium-severity vulnerability in Siyuan-Note Siyuan, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-09-04.
- How severe is CVE-2026-85578?
- Medium severity. CVSS v3 base score is 6.5 out of 10.