Vulnerability in Siyuan-Note Siyuan
CVE-2026-74868
SiYuan versions before 3.7.4 contain an unthrottled brute-force vulnerability in the Publish Service Basic Auth implementation (PublishServiceTransport.RoundTrip() in kernel/server/proxy/publish.go). The Publish Service runs on a separate, unauthenticated-by-default listener (default TCP port 6808) and gates named publish-viewer accounts (Conf.Publish.Auth.Accounts) with Basic Auth that has no rate limiting, per-account lockout, or backoff. Unauthenticated remote attackers can submit unlimited password guesses against named accounts to gain access to published notes/notebooks.
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.
Affected products
- Siyuan-note Siyuan — versions 0, 3.7.4
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-74868?
- CVE-2026-74868 is a high-severity vulnerability in Siyuan-Note Siyuan, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 7.5/10. Published 2026-08-17.
- How severe is CVE-2026-74868?
- High severity. CVSS v3 base score is 7.5 out of 10.