CVE-2026-34600
MediumCVSS 5.7Exploitation Probability (EPSS)
Low risk19th percentile - higher than 19% of all known CVEs
Summary
Joplin versions 3.5.2 and earlier contain a logic error in the delta API that allows share recipients to download notes that are no longer shared with them. The flaw stems from improper filtering of item state and change compression, leading to data leakage.
Risk Assessment
Users who previously had access to notes can still download their full content, compromising data confidentiality and potentially leaking sensitive information.
Recommendation
Immediately update Joplin to version 3.5.3 or later, which contains the fix.
Other vulnerabilities in Joplin
See all- CVE-2022-35131Critical
Joplin version 2.8.8 contains a vulnerability that allows arbitrary command execution. The attack is performed by injecting a crafted payload into note titles.
- CVE-2025-57798Medium
Joplin, an open-source note-taking and to-do application, versions 3.6.14 and prior, contains a Denial of Service (DoS) vulnerability in the note title input due to missing length validation. An attacker can cause an Out Of Memory (OOM) error and program termination by inserting an excessively long string into a note's title, either via the UI or through the local web service API (port 41184) after compromising an authentication token. The issue is fixed in version 3.7.1.
- CVE-2026-22810High
Joplin prior to version 3.5.7 contains a path traversal vulnerability in the importer, allowing arbitrary file overwrite. The OneNote converter does not sanitize embedded file names, enabling ../.. sequences.
- CVE-2023-37299Medium
Joplin before 2.11.5 allows XSS via an AREA element of an image map.
- CVE-2023-37298Medium
Joplin versions before 2.11.5 allow XSS via a USE element in an SVG document.
Original NVD description (English source)
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.