makeplane Plane up to 1.3.x cycles WorkspaceCyclesEndpoint/WorkspaceModulesEndpoint improper authorization

Summaryinfo

A vulnerability classified as problematic has been found in makeplane Plane up to 1.3.x. This affects the function WorkspaceCyclesEndpoint/WorkspaceModulesEndpoint of the file /api/workspaces/{slug}/cycles/. The manipulation leads to improper authorization. This vulnerability is uniquely identified as CVE-2026-104963. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in makeplane Plane up to 1.3.x. It has been rated as problematic. This issue affects the function WorkspaceCyclesEndpoint/WorkspaceModulesEndpoint of the file /api/workspaces/{slug}/cycles/. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality. The summary by CVE is:

Plane is an open-source project management tool. Prior to 1.4.0, GET /api/workspaces/{slug}/cycles/ through WorkspaceCyclesEndpoint and GET /api/workspaces/{slug}/modules/ through WorkspaceModulesEndpoint return records from every project in a workspace without checking whether the requester belongs to each project. Any authenticated workspace member, including a Guest with access to only one project, can enumerate names, descriptions, sprint dates, issue counts, progress snapshots, external integration IDs, linked URLs, and member lists for cycles and modules in private projects. The sibling WorkspaceLabelsEndpoint and WorkspaceStatesEndpoint apply the correct project__project_projectmember__member=request.user filter, making the cycle and module endpoints inconsistent outliers. This issue is fixed in 1.4.0.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-104963 since 10/02/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

Upgrading to version 1.4.0 eliminates this vulnerability.

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Productinfo

Vendor

• makeplane

Name

• Plane

Version

• 1.0
• 1.1
• 1.2
• 1.3

Website

• Product: https://github.com/makeplane/plane/

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