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CVE-2026-85578— SiYuan through 3.8.1 Authorization Bypass via getFile

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 3.8.1及之前版本存在授权问题漏洞，该漏洞源于/api/file/getFile端点存在授权绕过漏洞，可能允许读者角色攻击者在已知隐藏笔记本标识符和文件路径的情况下，检索显式配置为Visible:false的笔记本中的文件，导致私有工作区文件（包括笔记本元数据和内部配置）泄露。

CVSS 6.5 · Medium EPSS 0.38% · P30

Affected Version Matrix 1

VendorProduct Version RangeStatus
siyuan-note siyuan ≤ 3.8.1 affected
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I. Basic Information for CVE-2026-85578

Vulnerability Information
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Vulnerability Title
SiYuan through 3.8.1 Authorization Bypass via getFile
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan through 3.8.1 contains an authorization bypass vulnerability in the /api/file/getFile endpoint that allows readers to retrieve files from notebooks explicitly configured as Visible:false. Attackers with reader role can access private workspace files including notebook metadata and internal configuration by knowing the hidden notebook identifier and file path.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 授权问题漏洞
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 3.8.1及之前版本存在授权问题漏洞，该漏洞源于/api/file/getFile端点存在授权绕过漏洞，可能允许读者角色攻击者在已知隐藏笔记本标识符和文件路径的情况下，检索显式配置为Visible:false的笔记本中的文件，导致私有工作区文件（包括笔记本元数据和内部配置）泄露。
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 ~ 3.8.1 -

II. Public POCs for CVE-2026-85578

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III. Intelligence Information for CVE-2026-85578

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Vendor Advisories for CVE-2026-85578 (2)

Same Patch Batch · siyuan-note · 2026-09-04 · 8 CVEs total

CVE-2026-85584 7.5 HIGH SiYuan before v3.8.2 Denial of Service via Auth Throttle
CVE-2026-85581 7.5 HIGH SiYuan before v3.8.2 Denial of Service via unauthenticated UI-process registration
CVE-2026-85585 7.5 HIGH SiYuan before v3.8.2 Unbounded Memory Consumption via ControlConcurrency
CVE-2026-85583 6.5 MEDIUM SiYuan before v3.8.2 Path Traversal via symlink in file API
CVE-2026-85582 6.5 MEDIUM SiYuan before v3.8.2 Unbounded Session Creation via Basic Auth
CVE-2026-85580 6.5 MEDIUM SiYuan before v3.8.2 Path Guard Bypass via Case Mismatch
CVE-2026-85579 4.3 MEDIUM SiYuan before v3.8.2 Information Disclosure via undoState

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-862

V. Comments for CVE-2026-85578

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