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CVE-2026-74800— SiYuan before v3.7.4 Stored XSS via assets endpoint

Quick assessment

Affected
siyuan-note siyuan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SiYuan是SiYuan团队开源的一款文档管理软件。 SiYuan 3.7.4之前版本存在跨站脚本漏洞，该漏洞源于提供任意文件资产时未设置Content-Disposition和X-Content-Type-Options标头，可能导致存储型跨站脚本攻击。经过身份验证的攻击者可上传HTML文件作为资产，并在工作区所有者打开资产链接时执行具有完整内核API访问权限的脚本。

CVSS 9.0 · Critical EPSS 0.43% · P35

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.7.4 affected
3.7.4 unaffected
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I. Basic Information for CVE-2026-74800

Vulnerability Information
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Vulnerability Title
SiYuan before v3.7.4 Stored XSS via assets endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan before v3.7.4 fails to set Content-Disposition and X-Content-Type-Options headers when serving arbitrary file assets, allowing stored cross-site scripting attacks. Authenticated attackers can upload HTML files as assets and execute scripts with full kernel API access when the workspace owner opens the asset link.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 跨站脚本漏洞
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之前版本存在跨站脚本漏洞，该漏洞源于提供任意文件资产时未设置Content-Disposition和X-Content-Type-Options标头，可能导致存储型跨站脚本攻击。经过身份验证的攻击者可上传HTML文件作为资产，并在工作区所有者打开资产链接时执行具有完整内核API访问权限的脚本。
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-2026-74800

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III. Intelligence Information for CVE-2026-74800

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Vendor Advisories for CVE-2026-74800 (2)

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-2026-74798 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
CVE-2026-74867 4.2 MEDIUM SiYuan before 3.7.4 Cross-Site Request Forgery via CheckAuth

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-79

V. Comments for CVE-2026-74800

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