Description
Plane is an open-source project management tool. Prior to 1.4.0, the GraphQL joinProject mutation lets any workspace member add themselves to any project in that workspace including network=0 (secret/private) projects they were never invited to and grants them a full Member role (read + write). The resolver checks only workspace-level membership/role and never checks the target project's visibility (network). This collapses project-level tenant isolation within a workspace: a low-privilege member can read and modify confidential data in every private project. This issue is fixed in 1.4.0.
Published: 2026-10-05
Score: 8.7 High
EPSS: < 1% Very Low
KEV: No
Impact: Unauthorized data disclosure and modification across private projects
Action: Immediate Patch
AI Analysis

Impact

The Plane GraphQL joinProject mutation is missing proper access control checks. As a result, any member of a workspace can add themselves to any project within that workspace, even projects marked private or secret. By doing so, a low‑privilege member obtains a full Member role, granting read and write permissions to confidential data. This vulnerability is a classic CWE‑284 Broken Access Control that allows attackers to read and modify sensitive project information without proper authorization.

Affected Systems

The vulnerability affects the open‑source project management tool Plane from makeplane. All releases prior to v1.4.0 are impacted. Version 1.4.0 and later contain the fix.

Risk and Exploitability

With a CVSS score of 8.7, the vulnerability is classified as high severity. The EPSS score is unavailable, and the threat is not listed in the CISA KEV catalog. The attack is likely initiated via the public GraphQL API; any authenticated workspace member can exploit the flaw without additional privileges. The barrier to exploitation is low, making the risk significant for any environment where Plane is used for confidential project data.

Generated by OpenCVE AI on October 5, 2026 at 20:10 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade Plane to version 1.4.0 or later, which contains the access control fix.
  • Disallow the joinProject mutation for non‑admin users or enforce project‑level visibility checks via custom authorization middleware.
  • Monitor workspace membership changes and audit project access roles to detect any unauthorized joins or escalations.

Generated by OpenCVE AI on October 5, 2026 at 20:10 UTC.

Tracking

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Advisories

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History

Mon, 05 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Makeplane
Makeplane plane
Vendors & Products Makeplane
Makeplane plane
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Mon, 05 Oct 2026 18:00:00 +0000

Type Values Removed Values Added
Description Plane is an open-source project management tool. Prior to 1.4.0, the GraphQL joinProject mutation lets any workspace member add themselves to any project in that workspace including network=0 (secret/private) projects they were never invited to and grants them a full Member role (read + write). The resolver checks only workspace-level membership/role and never checks the target project's visibility (network). This collapses project-level tenant isolation within a workspace: a low-privilege member can read and modify confidential data in every private project. This issue is fixed in 1.4.0.
Title Plane: Broken Access Control - joinProject GraphQL mutation allows self-join into private (secret) projects
Weaknesses CWE-284
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N'}

Subscriptions

Makeplane Plane
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-10-05T19:13:21.788Z

Reserved: 2026-10-05T16:40:39.611Z

Link: CVE-2026-105632

cve-icon Vulnrichment

Updated: 2026-10-05T19:12:51.612Z

cve-icon NVD

Status : Deferred

Published: 2026-10-05T18:17:36.593

Modified: 2026-10-05T20:17:11.050

Link: CVE-2026-105632

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-05T20:15:16Z

Weaknesses