# CVE-2026-104966: Plane authorization bypass in estimates and comments endpoints

Source: https://junglewise.ai/threats/cve-2026-104966-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-2026-104966 · Severity: info · Published 2026-10-05

Plane is an open-source project management tool used to organize work across teams and workspaces. Before version 1.4.0, two API endpoints failed to properly verify that resource identifiers belonged to the correct workspace, allowing an authenticated user to read or modify estimates and inject comments from other 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-2026-104966 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-104966 being exploited in the wild.

**How severe is CVE-2026-104966?** Informational severity, published 5 October 2026.

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

**Is there a fix for CVE-2026-104966?** 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-2026-104966 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-104966?** 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

Two endpoint families fail to verify that nested resource identifiers belong to the workspace and project in the URL: PATCH /api/workspaces/{slug}/projects/{project_id}/estimates/{estimate_id}/ and POST /api/workspaces/{slug}/projects/{project_id}/issues/{issue_id}/comments/. The ProjectEntityPermission middleware correctly validates workspace and project membership, but the estimate_id and issue_id are fetched by primary key alone without confirming they belong to that workspace and project scope. An authenticated attacker can exploit this insecure direct object reference (IDOR) to read/modify estimates or inject comments across workspace boundaries. The fix adds workspace and project scoped ownership checks before creating or modifying these nested resources.

## Affected products

- Plane Plane before 1.4.0

## Timeline

- 2026-10-05: disclosed

## References

- [https://github.com/makeplane/plane/commit/971c2aadb4e848d70676b4f58b94bc7992dfe5fc](https://github.com/makeplane/plane/commit/971c2aadb4e848d70676b4f58b94bc7992dfe5fc)
- [https://github.com/makeplane/plane/pull/9286](https://github.com/makeplane/plane/pull/9286)

## 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)