Auth bypass in Siyuan-Note Siyuan
CVE-2026-68587
SiYuan versions before v3.7.3 contain an information disclosure vulnerability in the getHeadingDeleteTransaction, getHeadingLevelTransaction, and getHeadingInsertTransaction endpoints that return rendered block DOM without publish-access checks. Anonymous readers or publish RoleReader tokens can supply a heading block ID to read full rendered content of publish-disabled documents that should be restricted.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (25.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.003 · change: -0.001
Affected products
- Siyuan-Note Siyuan — versions 0, 3.7.3
Weakness classification (CWE)
References
- github.com/siyuan-note/siyuan/security/advisories/GHSA-69mh-gvh4-8gp7 (vendor-advisory)
- www.vulncheck.com/advisories/siyuan-before-information-disclosure-via-getheadin… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-68587?
- CVE-2026-68587 is a high-severity vulnerability in Siyuan-Note Siyuan, classified under Missing Authorization. CVSS score: 8.6/10. Published 2026-08-03.
- How severe is CVE-2026-68587?
- High severity. CVSS v3 base score is 8.6 out of 10.