CVE-2026-74867

Medium

Description

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.

SeverityMedium

CVSS4.2

Exploit probability—

ProductSiyuan

PublishedAug 17, 2026

First seenAug 17, 2026

Weakness typeCWE-352Cross-site request forgery (CSRF)

How to fix

Update

siyuan-note siyuan3.7.4 or later

Vendor advisories

github.com/siyuan-note/siyuan/security/advisories/GHSA-hhm2-g993-p656

Affected products

Product	Affected versions	Fixed in
siyuan-note siyuan	v < 3.7.4	3.7.4

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