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CVE-2026-75916— SiYuan XSS-to-RCE via unescaped block metadata in hint popup

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 3.7.3及之前版本存在跨站脚本漏洞，该漏洞源于块引用自动补全提示弹出窗口中候选块的名称、别名和备忘录字段未转义直接拼接HTML，可能导致跨站脚本攻击，并可能升级为任意操作系统命令执行。

CVSS 8.6 · High EPSS 0.16% · P6

Affected Version Matrix 1

VendorProduct Version RangeStatus
siyuan-note siyuan any affected
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I. Basic Information for CVE-2026-75916

Vulnerability Information
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Vulnerability Title
SiYuan XSS-to-RCE via unescaped block metadata in hint popup
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan through 3.7.3 contains a cross-site scripting vulnerability in the '((' block-reference autocomplete hint popup. In genHintItemHTML() (app/src/protyle/hint/extend.ts), a candidate block's name, alias, and memo fields are concatenated into the popup's HTML without escaping. An attacker who can set these metadata fields on a block can inject a self-firing payload (e.g. <img src=x onerror=...>) that executes automatically when a victim types '((' followed by a search term that surfaces the crafted block. Because SiYuan's Electron windows run with nodeIntegration enabled, contextIsolation disabled, and no CSP, the injected script gains require('child_process') access, allowing the XSS to escalate to arbitrary OS command execution.
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 3.7.3及之前版本存在跨站脚本漏洞，该漏洞源于块引用自动补全提示弹出窗口中候选块的名称、别名和备忘录字段未转义直接拼接HTML，可能导致跨站脚本攻击，并可能升级为任意操作系统命令执行。
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 - -

II. Public POCs for CVE-2026-75916

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III. Intelligence Information for CVE-2026-75916

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Vendor Advisories for CVE-2026-75916 (2)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-75916

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