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CVE-2026-40265— Note Mark has Broken Access Control on Asset Download

Quick assessment

Affected
enchant97 note-mark
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.

Note Mark是Leo Spratt个人开发者的一个基于网络的Markdown笔记应用程序。 Note Mark 0.19.1及之前版本存在安全漏洞，该漏洞源于/api/notes/{noteID}/assets/{assetID}处的资产下载端点未注册身份验证中间件，且后端查询未验证所有权或书籍可见性，可能导致未经身份验证的用户在知道有效笔记ID和资产ID的情况下检索私有笔记资产的完整内容。

CVSS 5.9 · Medium EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-40265

Vulnerability Information
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Vulnerability Title
Note Mark has Broken Access Control on Asset Download
Source: CVE Program / CVE List V5
Vulnerability Description
Note Mark is an open-source note-taking application. In versions 0.19.1 and prior, the asset download endpoint at /api/notes/{noteID}/assets/{assetID} is registered without authentication middleware, and the backend query does not verify ownership or book visibility. An unauthenticated user who knows a valid note ID and asset ID can retrieve the full contents of private note assets without authentication, regardless of whether the associated book is public or private. This issue has been fixed in version 0.19.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/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
Note Mark 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Note Mark是Leo Spratt个人开发者的一个基于网络的Markdown笔记应用程序。 Note Mark 0.19.1及之前版本存在安全漏洞，该漏洞源于/api/notes/{noteID}/assets/{assetID}处的资产下载端点未注册身份验证中间件，且后端查询未验证所有权或书籍可见性，可能导致未经身份验证的用户在知道有效笔记ID和资产ID的情况下检索私有笔记资产的完整内容。
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
enchant97 note-mark < 0.19.2 -

II. Public POCs for CVE-2026-40265

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III. Intelligence Information for CVE-2026-40265

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Patches & Fixes for CVE-2026-40265 (1)

Vendor Advisories for CVE-2026-40265 (1)

Same Patch Batch · enchant97 · 2026-04-16 · 3 CVEs total

CVE-2026-40262 8.7 HIGH Note Mark has Stored XSS via Unrestricted Asset Upload
CVE-2026-40263 3.7 LOW Note Mark: Username Enumeration via Login Endpoint Timing Side-Channel

IV. Related Vulnerabilities

Same product: note-mark
Same vendor: enchant97
Same weakness: CWE-862

V. Comments for CVE-2026-40265

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