# CVE-2026-104970: Plane instance admin signup race condition

Source: https://junglewise.ai/threats/cve-2026-104970-plane-is-an-open-source-project-management-tool-from-0-13-until  
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-2026-104970 · Severity: high · CVSS 8.1 · Published 2026-10-05

Plane is an open-source project management tool used to organize work and coordinate teams. A vulnerability in versions before 1.4.0 allows two unauthenticated attackers to simultaneously sign up and both receive instance administrator privileges, granting them complete control over the system without the legitimate operator's knowledge or consent.

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

## Quick answers

**Is CVE-2026-104970 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-104970 being exploited in the wild.

**How severe is CVE-2026-104970?** High severity, with a CVSS score of 8.1, published 5 October 2026.

**Which products and versions are affected?** Makeplane Plane 0.13 to 1.3.x.

**Is there a fix for CVE-2026-104970?** 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-2026-104970 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-104970?** Check whether you run Makeplane 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 InstanceAdminSignUpEndpoint in apps/api/plane/license/api/views/admin.py contains a time-of-check-time-of-use (TOCTOU) race condition in the first-admin check. The code queries for existing instance administrators using InstanceAdmin.objects.first() without atomic transactions, row locks, or uniqueness guards, allowing concurrent unauthenticated requests with different email addresses to both observe no admin exists and create separate admin accounts. An attacker can exploit this by sending two concurrent signup requests to simultaneously elevate to instance-admin authority.

## Affected products

- Makeplane Plane 0.13 to 1.3.x

## Timeline

- 2026-10-05: disclosed

## References

- [https://github.com/makeplane/plane/commit/7fbf14a6cb494bbf5866e2b293b28a6d8a7e52c3](https://github.com/makeplane/plane/commit/7fbf14a6cb494bbf5866e2b293b28a6d8a7e52c3)
- [https://github.com/makeplane/plane/pull/9332](https://github.com/makeplane/plane/pull/9332)

## Related threats

- [makeplane plane rate limit bypass via X-Forwarded-For header](https://junglewise.ai/threats/cve-2026-111869-a-vulnerability-was-identified-in-makeplane-plane-up-to-1-4-2)
- [Plane account takeover via unverified OAuth email](https://junglewise.ai/threats/cve-2026-105640-plane-is-an-open-source-project-management-tool-prior-to-1-4-0)
- [Plane project management asset IDOR in bulk-asset endpoint](https://junglewise.ai/threats/cve-2026-105637-plane-is-an-open-source-project-management-tool-prior-to-1-4-0)
- [Plane privilege escalation in project member role updates](https://junglewise.ai/threats/cve-2026-105634-plane-is-an-open-source-project-management-tool-prior-to-1-3-0)
- [Plane project management tool asset access control bypass](https://junglewise.ai/threats/cve-2026-105631-plane-is-an-open-source-project-management-tool-prior-to-1-4-0)