What is CVE-2026-74867?

CVE-2026-74867 is a medium-severity vulnerability in Siyuan-Note Siyuan, classified under Cross-Site Request Forgery (CSRF). CVSS score: 4.2/10. Published 2026-08-17.

How severe is CVE-2026-74867?

Medium severity. CVSS v3 base score is 4.2 out of 10.

CSRF in Siyuan-Note Siyuan

CVE-2026-74867

SiYuan versions before 3.7.4 contain a cross-site request forgery vulnerability in the session-cookie authentication branch of CheckAuth() that lacks Origin/Referer validation and sets no explicit SameSite attribute on session cookies. Attackers can craft malicious web pages that perform unauthorized actions on behalf of authenticated users by submitting requests with valid session cookies, relying on browser default SameSite policies rather than server-enforced protections.

Vulnerability class: CSRF (Cross-Site Request Forgery)

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N.

Affected products

Siyuan-note Siyuan — versions 0, 3.7.4

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-74867?: CVE-2026-74867 is a medium-severity vulnerability in Siyuan-Note Siyuan, classified under Cross-Site Request Forgery (CSRF). CVSS score: 4.2/10. Published 2026-08-17.
How severe is CVE-2026-74867?: Medium severity. CVSS v3 base score is 4.2 out of 10.