What is CVE-2026-85578?

CVE-2026-85578 is a medium-severity vulnerability, 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.

CVE-2026-85578

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

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.

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

disclosure@vulncheck.com
disclosure@vulncheck.com

Frequently asked questions

What is CVE-2026-85578?: CVE-2026-85578 is a medium-severity vulnerability, 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.