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9.1

Joplin Server allows unlimited guesses of SSO code

CVE-2026-46649 · published 21 days ago
Summary

Joplin Server versions before 3.7.2 let anyone repeatedly try a nine‑digit single sign‑on code without any limit. If the correct code is guessed, the attacker receives a full session token and can read or change the user's notes and settings. Update to version 3.7.2 or later to add the required protection.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
laurent22 joplin < 3.7.2
Original advisory text
Joplin: SSO Auth Code Login Missing Rate Limiting — 9-Digit Numeric Code Brute-Forceable via Unprotected Endpoint
Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.7.2, Joplin Server's GET /api/login_with_code/:id endpoint accepts a nine-digit SSO authentication code with a ten-minute lifetime without applying limiterLoginBruteForce. An unauthenticated attacker who targets a user during an active SSO login can make unlimited guesses, and a correct code returns a full session token that permits access to and modification of the user's notes, notebooks, and account settings. This issue is fixed in version 3.7.2.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.1 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-307Improper Restriction of Excessive Authentication Attempts
Timeline
Published21 Sep 2026
Updated11 Oct 2026
First seen21 Sep 2026
Sources
CVE-2026-46649 · NVD
CVE-2026-46649 · MITRE
CVE-2026-46649 · OSV
GHSA-6vwc-4hrg-qp5h · GHSA
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