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CVE-2026-77086— SiYuan before v3.7.4 Path Traversal via packageName

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之前版本存在路径遍历漏洞，该漏洞源于Bazaar安装和卸载端点未验证packageName参数，可能导致经过身份验证的管理员通过目录遍历序列进行路径遍历，写入任意文件或递归删除目录。

CVSS 9.1 · Critical EPSS 1.03% · P63

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

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-2026-77086

Vulnerability Information
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Vulnerability Title
SiYuan before v3.7.4 Path Traversal via packageName
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan before v3.7.4 fails to validate the packageName parameter in Bazaar install and uninstall endpoints, allowing authenticated administrators to perform path traversal via directory traversal sequences. Attackers with admin access can write arbitrary files to any location via install operations or recursively delete directories via uninstall operations by supplying crafted packageName values.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 路径遍历漏洞
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之前版本存在路径遍历漏洞，该漏洞源于Bazaar安装和卸载端点未验证packageName参数，可能导致经过身份验证的管理员通过目录遍历序列进行路径遍历，写入任意文件或递归删除目录。
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-2026-77086

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III. Intelligence Information for CVE-2026-77086

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Vendor Advisories for CVE-2026-77086 (1)

Other References for CVE-2026-77086 (1)

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-22

V. Comments for CVE-2026-77086

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