# CVE-2026-104964: Plane project update cross-workspace access control bypass

Source: https://junglewise.ai/threats/cve-2026-104964-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-2026-104964 · Severity: medium · CVSS 6.8 · Published 2026-10-05

Plane is an open-source project management tool that helps teams organize work and collaborate. Prior to version 1.4.0, administrators in one workspace could modify projects in another workspace if they knew the project's unique identifier, bypassing tenant isolation. An attacker could change project settings, metadata, or configuration in workspaces they should not have access to.

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

## Quick answers

**Is CVE-2026-104964 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-104964 being exploited in the wild.

**How severe is CVE-2026-104964?** Medium severity, with a CVSS score of 6.8, published 5 October 2026.

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

**Is there a fix for CVE-2026-104964?** 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-2026-104964 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-104964?** 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 project update endpoint checked authorization against the workspace slug in the request URL but retrieved the target project globally by UUID without re-validating it belonged to that workspace. This Insecure Direct Object Reference (IDOR) allowed any authenticated user with admin rights in one workspace to modify projects in other workspaces by supplying a known project UUID from a different workspace. The fix scopes the Project.objects.get() query to the requested workspace slug.

## Affected products

- Plane Plane before 1.4.0

## Timeline

- 2026-10-05: disclosed
- 2026-07-31: patched

## References

- [https://github.com/makeplane/plane/commit/9491bdbe46e269611f9dad9cfb5182c2da8ca65a](https://github.com/makeplane/plane/commit/9491bdbe46e269611f9dad9cfb5182c2da8ca65a)
- [https://github.com/makeplane/plane/releases/tag/v1.4.0](https://github.com/makeplane/plane/releases/tag/v1.4.0)

## 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)