CVE-2026-46649: CWE-307: Improper Restriction of Excessive Authentication Attempts in laurent22 joplin
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.
AI Analysis
Technical Summary
CVE-2026-46649 describes an improper restriction of excessive authentication attempts (CWE-307) in Joplin Server's SSO login endpoint. Before version 3.7.2, the GET /api/login_with_code/:id endpoint accepts a nine-digit SSO code with a ten-minute lifetime but does not apply brute force rate limiting (limiterLoginBruteForce). This allows unauthenticated attackers to perform unlimited guesses during an active SSO login attempt. A correct guess returns a full session token, granting access to the victim's notes, notebooks, and account settings. The vulnerability is resolved in Joplin Server version 3.7.2.
Potential Impact
An unauthenticated attacker can brute force the SSO authentication code without limitation, potentially gaining full access to a user's account and data. This includes the ability to view and modify notes, notebooks, and account settings, leading to a critical confidentiality and integrity breach.
Mitigation Recommendations
Upgrade Joplin Server to version 3.7.2 or later, where this vulnerability is fixed by applying proper brute force rate limiting to the SSO login endpoint. No other mitigations are indicated.
CVE-2026-46649: CWE-307: Improper Restriction of Excessive Authentication Attempts in laurent22 joplin
Description
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.
CVSS v4.0
Score 9.1critical
Affected software
laurent22
joplin
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-46649 describes an improper restriction of excessive authentication attempts (CWE-307) in Joplin Server's SSO login endpoint. Before version 3.7.2, the GET /api/login_with_code/:id endpoint accepts a nine-digit SSO code with a ten-minute lifetime but does not apply brute force rate limiting (limiterLoginBruteForce). This allows unauthenticated attackers to perform unlimited guesses during an active SSO login attempt. A correct guess returns a full session token, granting access to the victim's notes, notebooks, and account settings. The vulnerability is resolved in Joplin Server version 3.7.2.
Potential Impact
An unauthenticated attacker can brute force the SSO authentication code without limitation, potentially gaining full access to a user's account and data. This includes the ability to view and modify notes, notebooks, and account settings, leading to a critical confidentiality and integrity breach.
Mitigation Recommendations
Upgrade Joplin Server to version 3.7.2 or later, where this vulnerability is fixed by applying proper brute force rate limiting to the SSO login endpoint. No other mitigations are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-15T20:11:54.585Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ab19b5455bf5e2cf57763cb
Added to database: 09/21/2026, 21:02:12 UTC
Last enriched: 09/21/2026, 21:16:38 UTC
Last updated: 09/21/2026, 23:50:09 UTC
Views: 10
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