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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（思源笔记）3.8.1 及之前版本中， 接口存在授权绕过漏洞。该漏洞允许具有“读者”（reader）角色的用户获取被显式配置为 的笔记本中的文件。攻击者只要知道隐藏笔记本的标识符和文件路径，即可访问私有工作区的文件，包括笔记本元数据和内部配置信息。

CVSS 6.5 · Medium

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

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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