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CVE-2026-82651— SiYuan before v3.8.1 Missing Authorization via /history and /repo/diff

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之前版本存在信息泄露漏洞，该漏洞源于未对/history/path和/repo/diff/path端点应用IsForbiddenAbsPath防护，这些路由需要管理员身份验证但独立构造文件路径，可能导致已认证管理员检索敏感文件的历史快照，包括data/.siyuan/publishAccess.json（明文发布模式密码）和data/templates/下的文件。

CVSS 4.9 · Medium EPSS 0.48% · P40

Possible ATT&CK Techniques 1 AI

T1213 · Data from Information Repositories

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.8.1 affected
3.8.1 unaffected
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I. Basic Information for CVE-2026-82651

Vulnerability Information
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Vulnerability Title
SiYuan before v3.8.1 Missing Authorization via /history and /repo/diff
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan before v3.8.1 does not apply the IsForbiddenAbsPath guard (introduced in GHSA-c8r8-95hg-mp34) to the /history/*path and /repo/diff/*path endpoints in kernel/server/serve.go. These routes require admin authentication but construct file paths independently, so an authenticated administrator can retrieve historical snapshots of sensitive files that the guard is meant to block, including data/.siyuan/publishAccess.json (plaintext publish-mode passwords) and files under data/templates/.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 信息泄露漏洞
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之前版本存在信息泄露漏洞，该漏洞源于未对/history/*path和/repo/diff/*path端点应用IsForbiddenAbsPath防护，这些路由需要管理员身份验证但独立构造文件路径，可能导致已认证管理员检索敏感文件的历史快照，包括data/.siyuan/publishAccess.json（明文发布模式密码）和data/templates/下的文件。
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-2026-82651

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III. Intelligence Information for CVE-2026-82651

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Vendor Advisories for CVE-2026-82651 (2)

Same Patch Batch · siyuan-note · 2026-08-30 · 6 CVEs total

CVE-2026-82654 8.9 HIGH SiYuan before v3.8.1 Stored XSS via block name
CVE-2026-82653 8.9 HIGH SiYuan before v3.8.1 Stored XSS via confirmDialog
CVE-2026-82649 7.0 HIGH SiYuan before 3.8.1 Local Privilege Escalation via Uncontrolled Search Path
CVE-2026-82652 5.3 MEDIUM SiYuan before v3.8.1 Information Disclosure via Publish Access
CVE-2026-82650 4.4 MEDIUM SiYuan before v3.8.1 Path Traversal via /api/template/render

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-200

V. Comments for CVE-2026-82651

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