laurent22 Joplin up to 3.7.12 Web Clipper Server ClipperServer.ts improper authorization

Summaryinfo

A vulnerability categorized as critical has been discovered in laurent22 Joplin up to 3.7.12. This impacts an unknown function of the file packages/lib/ClipperServer.ts of the component Web Clipper Server. The manipulation results in improper authorization. This vulnerability is reported as CVE-2026-105783. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in laurent22 Joplin up to 3.7.12. It has been classified as critical. Affected is an unknown functionality of the file packages/lib/ClipperServer.ts of the component Web Clipper Server. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.7.13, when Joplin Desktop is running with the opt-in Web Clipper server enabled, the server in packages/lib/ClipperServer.ts sends Access-Control-Allow-Origin: * and allows an arbitrary website to call POST /auth and GET /auth/check because the pairing endpoints do not reject HTTP or HTTPS origins. The desktop confirmation dialog does not identify the requesting origin, so a victim who approves the generic prompt authorizes the attacking page, which then receives the permanent API token. The token provides ongoing read and write access to notes, folders, tags, resources, and master keys. This issue is fixed in version 3.7.13.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-105783 since 10/05/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

Upgrading to version 3.7.13 eliminates this vulnerability.

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Productinfo

Vendor

• laurent22

Name

• Joplin

Version

• 3.7.0
• 3.7.1
• 3.7.2
• 3.7.3
• 3.7.4
• 3.7.5
• 3.7.6
• 3.7.7
• 3.7.8
• 3.7.9
• 3.7.10
• 3.7.11
• 3.7.12

Website

• Product: https://github.com/laurent22/joplin/

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