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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (41.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.7% 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: 0.005 · change: +0.001
Affected products
- Siyuan-Note Siyuan — versions 0, 3.7.4
Weakness classification (CWE)
References
- github.com/siyuan-note/siyuan/security/advisories/GHSA-phg7-xcr4-q5wg (vendor-advisory)
- www.vulncheck.com/advisories/siyuan-before-brute-force-authentication-via-publi… (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.