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CVE-2026-34600— Joplin Server delta API returns note content after share access is revoked

Quick assessment

Affected
laurent22 joplin
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.

Joplin是Laurent Cozic个人开发者的一款开源的笔记和待办事项应用程序。 Joplin 3.5.2及之前版本存在信息泄露漏洞，该漏洞源于delta API中的逻辑错误，允许共享接收者下载不再与其共享的笔记，且变更压缩逻辑错误地将create - delete缩减为NOOP，可能导致信息泄露。

CVSS 5.7 · Medium EPSS 0.36% · P28

Possible ATT&CK Techniques 2 AI

T1530.001 T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
laurent22 joplin < 3.5.3 affected
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I. Basic Information for CVE-2026-34600

Vulnerability Information
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Vulnerability Title
Joplin Server delta API returns note content after share access is revoked
Source: CVE Program / CVE List V5
Vulnerability Description
Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Versions 3.5.2 and prior contain a logic error in the delta API that allows share recipients to download notes that are no longer shared with them, related to but not fully fixed by the prior patch in #14289. In ChangeModel.delta, when DELTA_INCLUDES_ITEMS is enabled (the default), the latest state of items is attached to delta output without verifying that those items are still shared with the requesting user, and the existing removal logic only filters items deleted for all users. Additionally, the change compression logic incorrectly reduces create - delete to NOOP, which is unsafe because compression is applied per page and an item can have multiple create events; if an earlier create falls on a separate page from a later create -> delete pair, the deletion is dropped and the sequence collapses to a create. As a result, the delta API returns a create event for a deleted item with the full latest content attached, exposing notes the user no longer has access to. This issue has been fixed in version 3.5.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
权限预留不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Joplin 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Joplin是Laurent Cozic个人开发者的一款开源的笔记和待办事项应用程序。 Joplin 3.5.2及之前版本存在信息泄露漏洞，该漏洞源于delta API中的逻辑错误，允许共享接收者下载不再与其共享的笔记，且变更压缩逻辑错误地将create - delete缩减为NOOP，可能导致信息泄露。
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
laurent22 joplin < 3.5.3 -

II. Public POCs for CVE-2026-34600

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III. Intelligence Information for CVE-2026-34600

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Patches & Fixes for CVE-2026-34600 (1)

Vendor Advisories for CVE-2026-34600 (1)

Other References for CVE-2026-34600 (1)

IV. Related Vulnerabilities

Same product: joplin
Same vendor: laurent22
Same weakness: CWE-281

V. Comments for CVE-2026-34600

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