Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-74902— SiYuan before v3.7.4 XSS-to-RCE via malicious filename upload

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，该漏洞源于文件上传验证流程未转义文件名，可能导致攻击者构造包含脚本负载的恶意文件名，当用户拖放或粘贴文件到编辑器时以完整操作系统命令权限执行任意命令。

CVSS 8.6 · High EPSS 0.15% · P4

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.7.4 affected
3.7.4 unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-74902

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
SiYuan before v3.7.4 XSS-to-RCE via malicious filename upload
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan before v3.7.4 contains a cross-site scripting vulnerability in the file upload validation flow that fails to escape filenames before inserting them into HTML via insertAdjacentHTML. Attackers can craft a malicious filename containing script payloads that execute with full OS command access when a user drags, drops, or pastes the file into the editor.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/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，该漏洞源于文件上传验证流程未转义文件名，可能导致攻击者构造包含脚本负载的恶意文件名，当用户拖放或粘贴文件到编辑器时以完整操作系统命令权限执行任意命令。
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-2026-74902

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-74902

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-74902 (1)

News Coverage for CVE-2026-74902 (1)

Same Patch Batch · siyuan-note · 2026-08-18 · 5 CVEs total

CVE-2026-74906 7.5 HIGH SiYuan before v3.7.4 Incorrect Authorization via Publish Access
CVE-2026-74904 7.5 HIGH SiYuan before v3.7.4 Missing Authorization via block API
CVE-2026-74905 7.1 HIGH SiYuan before v3.7.4 SSRF via IPv6 Transition Address Bypass
CVE-2026-74903 4.3 MEDIUM SiYuan before v3.7.4 Insufficient Access Control via spinBlockDOM

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-74902

No comments yet

Leave a comment