CVE-2026-105638: CWE-307: Improper Restriction of Excessive Authentication Attempts in makeplane plane
Description
Plane is an open-source project management tool. Prior to 1.4.0, Plane's magic-code email login uses a six-digit numeric OTP with approximately 20 bits of entropy. The verifier has no per-code failed-attempt counter, and an incorrect code does not increment a counter, invalidate the Redis entry, or lock the email address. The verifier extends django.views.View rather than DRF's APIView, so the configured AnonRateThrottle limit does not apply. The middleware stack also contains no Django-level rate limiter such as django-ratelimit, django-axes, or an IP-throttling middleware. This vulnerability is fixed in 1.4.0.
CVSS v3.1
Score 9.1critical
Affected software
makeplane
plane
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-105638 describes an improper restriction of excessive authentication attempts in Plane's magic-code email login prior to version 1.4.0. The OTP used is a six-digit numeric code with roughly 20 bits of entropy. The verifier does not implement per-code failed-attempt counters, does not invalidate Redis entries or lock email addresses on incorrect attempts, and bypasses Django REST Framework's AnonRateThrottle due to extending django.views.View instead of APIView. Additionally, no Django-level rate limiting middleware is present. This allows attackers to attempt unlimited OTP guesses without triggering rate limits or account locks. The vulnerability is fixed in Plane version 1.4.0.
Potential Impact
The vulnerability allows attackers to perform brute force attempts on the six-digit OTP login mechanism without effective rate limiting or account lockout, potentially leading to unauthorized access to user accounts. The CVSS score of 9.1 indicates a critical severity with high confidentiality and integrity impact but no availability impact.
Mitigation Recommendations
Upgrade Plane to version 1.4.0 or later, where this vulnerability is fixed. The fix includes proper rate limiting and account lockout mechanisms for failed OTP attempts. No additional mitigations are required if the system is updated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-05T16:40:39.611Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac3ed982cdf04f6562b656b
Added to database: 10/05/2026, 18:34:00 UTC
Last enriched: 10/05/2026, 18:48:30 UTC
Last updated: 10/05/2026, 19:19:10 UTC
Views: 9
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