# CVE-2026-104965: Plane issue-relation endpoint insecure direct object reference

Source: https://junglewise.ai/threats/cve-2026-104965-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-2026-104965 · Severity: medium · CVSS 5.4 · Published 2026-10-05

Plane is an open-source project management tool for organizing tasks and collaboration. A vulnerability in versions prior to 1.4.0 allows authenticated users to link issues between workspaces they do not own, potentially exposing sensitive project information through activity logs. An attacker with any account on a shared Plane instance can view issue metadata from other organizations or teams by creating cross-workspace links.

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

## Quick answers

**Is CVE-2026-104965 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-104965 being exploited in the wild.

**How severe is CVE-2026-104965?** Medium severity, with a CVSS score of 5.4, published 5 October 2026.

**Which products and versions are affected?** Plane prior to 1.4.0.

**Is there a fix for CVE-2026-104965?** 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-2026-104965 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-104965?** 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 issue-relation endpoint fails to validate that issue UUIDs provided in request bodies belong to the caller's workspace, enabling a cross-tenant IDOR (Insecure Direct Object Reference) vulnerability. An authenticated attacker can create relations linking their own issues to issues in other workspaces, causing metadata exposure via activity event records. The fix scopes all issue ID validation to the authenticated user's workspace and project.

## Affected products

- Plane Plane prior to 1.4.0

## Timeline

- 2026-10-05: disclosed

## References

- [https://github.com/makeplane/plane/commit/81d9873d7f1cf1d1252ed53c12dd33696be73a89](https://github.com/makeplane/plane/commit/81d9873d7f1cf1d1252ed53c12dd33696be73a89)
- [https://github.com/makeplane/plane/pull/9269](https://github.com/makeplane/plane/pull/9269)

## 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)