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CVE-2026-59809— SiYuan before v3.8.0 Secret Exfiltration via http_request URL

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团队开源的一个以隐私为先的个人知识管理系统。 SiYuan 3.8.0之前版本存在信息泄露漏洞，该漏洞源于将秘密占位符插入http_request MCP工具的目标URL参数中，可能导致攻击者将明文秘密值发送到任意公共主机，泄露存储的机密。

CVSS 4.9 · Medium EPSS 0.41% · P34

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.8.0 affected
3.8.0 unaffected
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I. Basic Information for CVE-2026-59809

Vulnerability Information
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Vulnerability Title
SiYuan before v3.8.0 Secret Exfiltration via http_request URL
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan before v3.8.0 interpolates secret placeholders into the destination URL parameter of the http_request MCP tool, allowing attackers to exfiltrate stored secrets. An MCP client can craft a request with an attacker-controlled URL containing secret placeholders to send plaintext secret values to any public host without confirmation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan团队开源的一个以隐私为先的个人知识管理系统。 SiYuan 3.8.0之前版本存在信息泄露漏洞，该漏洞源于将秘密占位符插入http_request MCP工具的目标URL参数中，可能导致攻击者将明文秘密值发送到任意公共主机，泄露存储的机密。
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 ~ 3.8.0 -

II. Public POCs for CVE-2026-59809

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III. Intelligence Information for CVE-2026-59809

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Vendor Advisories for CVE-2026-59809 (2)

Same Patch Batch · siyuan-note · 2026-08-22 · 4 CVEs total

CVE-2026-60084 8.7 HIGH SiYuan before v3.7.4 Arbitrary File Deletion via removeTemplate
CVE-2026-62204 6.6 MEDIUM SiYuan before v3.7.4 Plugin Overwrite via Bazaar Install
CVE-2026-60083 4.9 MEDIUM SiYuan before v3.8.0 Incomplete Path Blocklist via MCP file tool

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-201

V. Comments for CVE-2026-59809

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