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CVE-2026-62204— SiYuan before v3.7.4 Plugin Overwrite via Bazaar Install

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 3.7.4之前版本存在输入验证错误漏洞，该漏洞源于未能验证packageName与下载的包内容是否匹配，可能导致同源攻击者通过提供不匹配的packageName和repoURL参数覆盖现有可信插件，实现应用重启后的持久化。

CVSS 6.6 · Medium EPSS 0.09% · P1

Possible ATT&CK Techniques 1 AI

T1195 · Supply Chain Compromise

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-2026-62204

Vulnerability Information
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Vulnerability Title
SiYuan before v3.7.4 Plugin Overwrite via Bazaar Install
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan versions before v3.7.4 fail to validate that packageName matches the downloaded package content in bazaar install endpoints. Attackers with same-origin access can overwrite existing trusted plugins by supplying mismatched packageName and repoURL parameters, achieving persistence across application restarts.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 输入验证错误漏洞
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 3.7.4之前版本存在输入验证错误漏洞，该漏洞源于未能验证packageName与下载的包内容是否匹配，可能导致同源攻击者通过提供不匹配的packageName和repoURL参数覆盖现有可信插件，实现应用重启后的持久化。
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-2026-62204

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III. Intelligence Information for CVE-2026-62204

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Vendor Advisories for CVE-2026-62204 (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-2026-60083 4.9 MEDIUM SiYuan before v3.8.0 Incomplete Path Blocklist via MCP file tool
CVE-2026-59809 4.9 MEDIUM SiYuan before v3.8.0 Secret Exfiltration via http_request URL

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-345

V. Comments for CVE-2026-62204

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