# CVE-2026-105633: Plane attachment ownership bypass via missing issue_id scoping

Source: https://junglewise.ai/threats/cve-2026-105633-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-2026-105633 · Severity: high · CVSS 7.1 · Published 2026-10-05

Plane is an open-source project management application that stores files and attachments. A vulnerability in the file attachment API allowed any project member to claim ownership of another user's file by exploiting a missing validation check, enabling unauthorized file access and account impersonation. This issue is fixed in version 1.4.0.

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

## Quick answers

**Is CVE-2026-105633 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-105633 being exploited in the wild.

**How severe is CVE-2026-105633?** High severity, with a CVSS score of 7.1, published 5 October 2026.

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

**Is there a fix for CVE-2026-105633?** 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-2026-105633 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-105633?** 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 V2 issue-attachment PATCH endpoint fails to validate the issue_id parameter when looking up FileAsset objects in the database, only checking pk, workspace, and project_id. An authenticated project member can supply a controlled issue_id in the URL while targeting another user's attachment UUID, and the PATCH handler will unconditionally set created_by = request.user, transferring ownership. This requires being an authenticated project member but no further privileges.

## Affected products

- Plane Plane before 1.4.0

## Timeline

- 2026-10-05: disclosed
- 2026-07-01: patched

## References

- [https://github.com/makeplane/plane/commit/5829f0febf0739494d576b60d4943d10d236bc96](https://github.com/makeplane/plane/commit/5829f0febf0739494d576b60d4943d10d236bc96)
- [https://github.com/makeplane/plane/pull/9315](https://github.com/makeplane/plane/pull/9315)

## 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)