What’s Vulnerable › Vulnerabilities

CVE-2026-105783: Joplin Web Clipper pairing allows cross-origin theft of a permanent API token

• Severity: high (CVSS 8.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-06 · updated 2026-10-06
• Weakness: CWE-346

Description

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.

Affected products

• laurent22 joplin: before 3.7.13

References

• https://github.com/laurent22/joplin/commit/27ae5c0d404ee47ad24862cce917dda6eb2930b7
• https://github.com/laurent22/joplin/pull/16276
• https://github.com/laurent22/joplin/releases/tag/v3.7.13
• https://github.com/laurent22/joplin/security/advisories/GHSA-9728-v7ww-mxjv

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