CVE-2026-74867

MEDIUM 4.2

SiYuan before 3.7.4 Cross-Site Request Forgery via CheckAuth

CVSS Score

4.2

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-352
Vendor	siyuan-note
Product	siyuan
Published	Aug 17, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

siyuan-note / siyuan

0 < 3.7.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hhm2-g993-p656 vulncheck.com: https://www.vulncheck.com/advisories/siyuan-before-cross-site-request-forgery-via-checkauth

Credits

🔍 alham-rizvi 🔍 l1nuxkid