# CVE-2026-105638: Plane magic-code OTP brute-force in email login

Source: https://junglewise.ai/threats/cve-2026-105638-plane-is-an-open-source-project-management-tool-prior-to-1-4-0  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-05. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-105638 · Severity: critical · CVSS 9.1 · Published 2026-10-05

Plane is an open-source project management and collaboration tool. Its magic-link email login feature generates six-digit numeric codes that lack rate limiting and attempt counting, allowing an attacker to brute-force the code and gain unauthorized access to any user account if they know the email address. This vulnerability enables account takeover without requiring a password.

Technologies: [Plane](https://junglewise.ai/threats/technologies/plane-plane). Vendors: [Plane](https://junglewise.ai/threats/vendors/plane).

## Quick answers

**Is CVE-2026-105638 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-105638 being exploited in the wild.

**How severe is CVE-2026-105638?** Critical severity, with a CVSS score of 9.1, published 5 October 2026.

**Which products and versions are affected?** Plane before 1.4.0.

**Is there a fix for CVE-2026-105638?** Yes: fixed in 1.4.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-105638 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-105638?** Check whether you run Plane at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 1.4.0

## Technical details

The magic-code email login uses a six-digit numeric OTP (~20 bits entropy) with a 600-second TTL, but the verification endpoint does not increment failed-attempt counters and does not inherit DRF's rate throttling because it extends django.views.View rather than APIView. Combined with the lack of per-IP rate limiting, an unauthenticated attacker can exhaust the ~900k code space within the TTL window. The fix caps verification attempts to 5 per token and applies authentication-level rate throttling.

## Affected products

- Plane Plane before 1.4.0

## Timeline

- 2026-10-05: disclosed

## References

- [https://github.com/makeplane/plane/commit/b1c78fe4c832e188454840eb38fd20cd05ef8b0a](https://github.com/makeplane/plane/commit/b1c78fe4c832e188454840eb38fd20cd05ef8b0a)
- [https://github.com/makeplane/plane/pull/9130](https://github.com/makeplane/plane/pull/9130)

## Related threats

- [Plane project management missing authorization checks](https://junglewise.ai/threats/cve-2026-102985-plane-is-an-open-source-project-management-tool-in-1-3-1-and)
- [Plane order_by injection in issue-listing endpoints](https://junglewise.ai/threats/cve-2026-102988-plane-is-an-open-source-project-management-tool-prior-to-1-4-0)
- [Plane stored XSS in comments and intake descriptions](https://junglewise.ai/threats/cve-2026-102982-plane-is-an-open-source-project-management-tool-prior-to-1-4-0)
- [Plane workspace invitation token disclosure and hijack](https://junglewise.ai/threats/cve-2026-102981-plane-is-an-open-source-project-management-tool-prior-to-1-4-0)
- [Plane hardcoded Django SECRET_KEY in community deployments](https://junglewise.ai/threats/cve-2026-105641-plane-is-an-open-source-project-management-tool-prior-to-1-4-0)