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CVE-2026-85579— SiYuan before v3.8.2 Information Disclosure via undoState

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 3.8.2之前版本存在授权问题漏洞，该漏洞源于读取者可访问的POST /api/transactions/undoState端点未应用发布访问可见性过滤，可能导致经过身份验证的读取者获取其他文档（包括私有或未发布）的内部根ID，泄露内部标识符和跨文档关系。

CVSS 4.3 · Medium EPSS 0.28% · P20

Possible ATT&CK Techniques 1 AI

T1212 · Exploitation for Credential Access

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.8.2 affected
3.8.2 unaffected
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I. Basic Information for CVE-2026-85579

Vulnerability Information
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Vulnerability Title
SiYuan before v3.8.2 Information Disclosure via undoState
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan is affected by an information disclosure vulnerability (confirmed in v3.8.1, fixed in v3.8.2) in the reader-accessible POST /api/transactions/undoState endpoint. The endpoint returns the peekMutatedRootIDs list from the global undo-log stack for a caller-supplied root ID without applying publish-access visibility filtering. An authenticated reader who knows the root ID of a visible document can obtain the internal root IDs of other documents (including private or unpublished ones) modified in the same cross-document transaction, disclosing internal identifiers and cross-document relationships. Document body contents are not directly exposed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
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 3.8.2之前版本存在授权问题漏洞，该漏洞源于读取者可访问的POST /api/transactions/undoState端点未应用发布访问可见性过滤，可能导致经过身份验证的读取者获取其他文档（包括私有或未发布）的内部根ID，泄露内部标识符和跨文档关系。
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 ~ 3.8.2 -

II. Public POCs for CVE-2026-85579

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III. Intelligence Information for CVE-2026-85579

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Vendor Advisories for CVE-2026-85579 (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-2026-85578 6.5 MEDIUM SiYuan through 3.8.1 Authorization Bypass via getFile
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

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-639

V. Comments for CVE-2026-85579

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