CVE-2026-74867— SiYuan before 3.7.4 Cross-Site Request Forgery via CheckAuth
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| siyuan-note | siyuan | < 3.7.4 | affected |
3.7.4 | unaffected |
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I. Basic Information for CVE-2026-74867
Vulnerability Information
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Vulnerability Title
SiYuan before 3.7.4 Cross-Site Request Forgery via CheckAuth
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 跨站请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan团队开源的一款文档管理软件。 SiYuan 3.7.4之前版本存在跨站请求伪造漏洞，该漏洞源于CheckAuth()的会话cookie身份验证分支缺少Origin/Referer验证且未设置显式SameSite属性，可能导致跨站请求伪造攻击，攻击者可构造恶意网页利用有效会话cookie代表已认证用户执行未经授权的操作。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| siyuan-note | siyuan | 0 ~ 3.7.4 | - |
II. Public POCs for CVE-2026-74867
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-74867 (2)
- 🔗 Session-cookie authentication branch of `CheckAuth()` has no Origin/Referer validation and the session cookie sets no explicit `SameSite` attribute, leaving CSRF protection entirely dependent on undocumented browser defaults · Advisory · siyuan-note/siyuan · GitHub Read full article vendor-advisory
Same Patch Batch · siyuan-note · 2026-08-17 · 7 CVEs total
| CVE-2026-74799 | 9.3 CRITICAL | SiYuan before 3.7.4 Unauthenticated Debug Endpoint Information Disclosure |
| CVE-2026-74800 | 9.0 CRITICAL | SiYuan before v3.7.4 Stored XSS via assets endpoint |
| CVE-2026-74798 | 8.7 HIGH | SiYuan kernel Path Traversal via database_clean MCP tool |
| CVE-2026-74801 | 8.2 HIGH | SiYuan before 3.7.4 Local Privilege Escalation via elevator.exe |
| CVE-2026-74802 | 8.2 HIGH | SiYuan 3.7.3 Cross-Site WebSocket Hijacking via network proxy |
| CVE-2026-74868 | 7.5 HIGH | SiYuan before 3.7.4 Brute-Force Authentication via Publish Service |
IV. Related Vulnerabilities
Same product: siyuan
- CVE-2026-75917
SiYuan before v3.7.4 XSS-to-RCE via pathName.ts - CVE-2026-75916
SiYuan XSS-to-RCE via unescaped block metadata in hint popup - CVE-2026-74906
SiYuan before v3.7.4 Incorrect Authorization via Publish Acc - CVE-2026-74905
SiYuan before v3.7.4 SSRF via IPv6 Transition Address Bypass - CVE-2026-74904
SiYuan before v3.7.4 Missing Authorization via block API
Same vendor: siyuan-note
- CVE-2026-75917
SiYuan before v3.7.4 XSS-to-RCE via pathName.ts - CVE-2026-75916
SiYuan XSS-to-RCE via unescaped block metadata in hint popup - CVE-2026-74906
SiYuan before v3.7.4 Incorrect Authorization via Publish Acc - CVE-2026-74905
SiYuan before v3.7.4 SSRF via IPv6 Transition Address Bypass - CVE-2026-74904
SiYuan before v3.7.4 Missing Authorization via block API
Same weakness: CWE-352
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WordPress HashBar – WordPress Notification Bar plugin <= 2.0 - CVE-2026-55593
Froxlor: CSRF Vulnerability in Froxlor AJAX Endpoint — Missi - CVE-2026-68923
MobSF: CSRF checks not enforced after Django migration - CVE-2026-45129
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V. Comments for CVE-2026-74867
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