CVE-2026-105638 Plane: Magic-code verifier endpoint has no rate limit, enabling 6-digit OTP brute force
Attackers can brute-force six-digit OTPs to bypass authentication and take over accounts due to missing rate limits on the magic-code verifier endpoint.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-105638?
CVE-2026-105638 is a critical authentication bypass vulnerability in makeplane plane, published on 5 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-307
Which versions are affected by CVE-2026-105638?
How do I fix CVE-2026-105638?
No fix has been published for CVE-2026-105638 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-105638 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-105638 exists.
Sources
Also known as GHSA-mqjv-rwgv-4gxq.