---
id: CVE-2026-104969
title: Plane is an open-source project management tool
summary: >-
  Plane is an open-source project management tool. Prior to 1.4.0, the
  cycle-issues endpoint accepts issue UUIDs in the request body without
  validating that they belong to the caller's workspace. An authenticated user
  can add issues from a…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-639
vendor: makeplane
product: plane
affected:
  - plane < 1.4.0
published: '2026-10-05'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T18:17:32.003'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104969'
references:
  - url: >-
      https://github.com/makeplane/plane/commit/81d9873d7f1cf1d1252ed53c12dd33696be73a89
    label: security-advisories@github.com
  - url: 'https://github.com/makeplane/plane/pull/9269'
    label: security-advisories@github.com
  - url: 'https://github.com/makeplane/plane/releases/tag/v1.4.0'
    label: security-advisories@github.com
  - url: 'https://github.com/makeplane/plane/security/advisories/GHSA-22g9-9xfv-q3fr'
    label: security-advisories@github.com
  - url: 'https://github.com/makeplane/plane/security/advisories/GHSA-22g9-9xfv-q3fr'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-05T17:47:06.863715Z'
ingestedAt: '2026-10-05T17:27:45.053Z'
---

## Overview

Plane is an open-source project management tool. Prior to 1.4.0, the cycle-issues endpoint accepts issue UUIDs in the request body without validating that they belong to the caller's workspace. An authenticated user can add issues from any workspace to a cycle they control. If a victim issue is already assigned to a cycle, the operation removes it from the victim's cycle, causing a destructive cross-tenant write. This issue is fixed in 1.4.0.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.