# CVE-2026-104970: Race condition in plane

> Concurrent unauthenticated requests can race to create multiple instance admin accounts, granting attackers unrestricted administrative access to the Plane instance.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Oct 2026
- **Updated:** 6 Oct 2026
- **Also known as:** GHSA-p548-28jp-wr4p

## What is CVE-2026-104970?

CVE-2026-104970 is a high-severity 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. From 0.13 until 1.4.0, InstanceAdminSignUpEndpoint in apps/api/plane/license/api/views/admin.py:89-117, 173-229 uses InstanceAdmin.objects.first() for the first-admin check and performs account creation without an atomic transaction, row lock, uniqueness guard, or advisory lock. Two concurrent unauthenticated requests with different email addresses can both observe that no instance administrator exists, create separate User and InstanceAdmin rows, and receive sessions with instance-admin authority. This allows an attacker to share unrestricted instance administration with the legitimate operator. This issue is fixed in 1.4.0.

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2026-104970?


## How do I fix CVE-2026-104970?

No fix has been published for CVE-2026-104970 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-104970 being exploited?

There is no known exploitation of CVE-2026-104970 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-104970 and fix it if it is affected.

What it is: CVE-2026-104970 is a high-severity 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.
Exploitation: There is no known exploitation of CVE-2026-104970 in the wild and no public exploit code.

Affected product: makeplane plane. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-104970/ (Markdown: https://insights.sbomify.com/CVE-2026-104970/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-104970
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-104970
- OSV: https://osv.dev/vulnerability/CVE-2026-104970

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-104970/
Summaries are generated and may contain mistakes; the official description above is the record.